diff --git a/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/edit/page.tsx b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/edit/page.tsx
new file mode 100644
index 0000000..384d23a
--- /dev/null
+++ b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/edit/page.tsx
@@ -0,0 +1,5 @@
+import { TenantLessonEditPage } from "./tenant-lesson-edit-page";
+
+export default function LessonEditRoutePage() {
+  return <TenantLessonEditPage />;
+}
diff --git a/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/edit/tenant-lesson-edit-page.tsx b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/edit/tenant-lesson-edit-page.tsx
new file mode 100644
index 0000000..1de8f0d
--- /dev/null
+++ b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/edit/tenant-lesson-edit-page.tsx
@@ -0,0 +1,291 @@
+"use client";
+
+import type { components } from "@studiqo/api-client/generated";
+import { zodResolver } from "@hookform/resolvers/zod";
+import { isStudiqoApiError } from "@studiqo/api-client/errors";
+import Link from "next/link";
+import { useParams, useRouter } from "next/navigation";
+import { useEffect, useState } from "react";
+import { useForm } from "react-hook-form";
+
+import { useLessonDetailQuery, useUpdateLessonMutation } from "@/lib/api/lessons-query";
+import { useOrganizationMembersQuery } from "@/lib/api/organization-members-query";
+import { useSubjectsListQuery } from "@/lib/api/subjects-query";
+import {
+  parseDatetimeLocalToIso,
+  parseIsoDateTime,
+  toDatetimeLocalValue,
+} from "@/lib/datetime";
+import { formatOrgMemberOptionLabel } from "@/lib/format-org-member";
+import { useTenantOrganizationId } from "@/lib/hooks/use-tenant-organization";
+import { useSession } from "@/lib/auth/session";
+import { isOrgAdminOrSuperadmin } from "@/lib/tenant-role";
+import {
+  updateLessonFormSchema,
+  type UpdateLessonForm,
+} from "@/lib/validation/lesson-forms";
+
+type Lesson = components["schemas"]["Lesson"];
+type UpdateLessonBody = components["schemas"]["UpdateLessonRequest"];
+
+function buildUpdateBody(lesson: Lesson, values: UpdateLessonForm): UpdateLessonBody {
+  const body: UpdateLessonBody = {};
+  if (
+    values.tutorId &&
+    values.tutorId !== "" &&
+    values.tutorId !== lesson.tutorId
+  ) {
+    body.tutorId = values.tutorId;
+  }
+  if (
+    values.subjectId &&
+    values.subjectId !== "" &&
+    values.subjectId !== lesson.subjectId
+  ) {
+    body.subjectId = values.subjectId;
+  }
+  if (values.startsAtLocal?.trim()) {
+    const iso = parseDatetimeLocalToIso(values.startsAtLocal.trim());
+    if (iso !== lesson.startsAt) {
+      body.startsAt = iso;
+    }
+  }
+  if (values.endsAtLocal?.trim()) {
+    const iso = parseDatetimeLocalToIso(values.endsAtLocal.trim());
+    if (iso !== lesson.endsAt) {
+      body.endsAt = iso;
+    }
+  }
+  if (values.notes !== undefined) {
+    const next = values.notes === "" ? null : values.notes;
+    const prev = lesson.notes;
+    if (next !== prev) {
+      body.notes = next;
+    }
+  }
+  return body;
+}
+
+export function TenantLessonEditPage() {
+  const params = useParams<{ tenantSlug: string; lessonId: string }>();
+  const { tenantSlug, lessonId } = params;
+  const router = useRouter();
+  const { user } = useSession();
+  const { organizationId, orgsLoading } = useTenantOrganizationId(tenantSlug);
+  const canManage = isOrgAdminOrSuperadmin(
+    user?.role,
+    user?.isSuperadmin ?? false,
+  );
+  const lessonQ = useLessonDetailQuery(organizationId, lessonId);
+  const subjectsQ = useSubjectsListQuery(organizationId);
+  const membersQ = useOrganizationMembersQuery(organizationId, canManage);
+  const updateLesson = useUpdateLessonMutation(organizationId ?? "");
+  const [formError, setFormError] = useState<string | null>(null);
+
+  const form = useForm<UpdateLessonForm>({
+    resolver: zodResolver(updateLessonFormSchema),
+    defaultValues: {
+      tutorId: "",
+      subjectId: "",
+      startsAtLocal: "",
+      endsAtLocal: "",
+      notes: "",
+    },
+  });
+
+  const lesson = lessonQ.data;
+  useEffect(() => {
+    if (lesson && lesson.status === "scheduled") {
+      form.reset({
+        tutorId: lesson.tutorId,
+        subjectId: lesson.subjectId,
+        startsAtLocal: toDatetimeLocalValue(parseIsoDateTime(lesson.startsAt)),
+        endsAtLocal: toDatetimeLocalValue(parseIsoDateTime(lesson.endsAt)),
+        notes: lesson.notes ?? "",
+      });
+    }
+  }, [lesson, form]);
+
+  const base = `/t/${tenantSlug}/lessons`;
+
+  if (!canManage) {
+    return (
+      <main>
+        <h1 style={{ fontSize: 22 }}>Edit lesson</h1>
+        <p style={{ opacity: 0.85 }}>
+          Only organization admins can edit lessons.
+        </p>
+        <p>
+          <Link href={`${base}/${lessonId}`}>Back to lesson</Link>
+        </p>
+      </main>
+    );
+  }
+
+  if (orgsLoading || !organizationId) {
+    return (
+      <main>
+        <p>
+          <Link href={`${base}/${lessonId}`}>← Lesson</Link>
+        </p>
+        <p>Loading…</p>
+      </main>
+    );
+  }
+
+  if (lessonQ.isLoading) {
+    return (
+      <main>
+        <p>
+          <Link href={`${base}/${lessonId}`}>← Lesson</Link>
+        </p>
+        <p>Loading lesson…</p>
+      </main>
+    );
+  }
+
+  if (lessonQ.error || !lesson) {
+    return (
+      <main>
+        <p>
+          <Link href={base}>← Lessons</Link>
+        </p>
+        <p style={{ color: "#b91c1c" }}>
+          {lessonQ.error instanceof Error
+            ? lessonQ.error.message
+            : "Could not load lesson"}
+        </p>
+      </main>
+    );
+  }
+
+  if (lesson.status !== "scheduled") {
+    return (
+      <main>
+        <p>
+          <Link href={`${base}/${lessonId}`}>← Lesson</Link>
+        </p>
+        <h1 style={{ fontSize: 22 }}>Edit lesson</h1>
+        <p style={{ opacity: 0.85 }}>
+          Only scheduled lessons can be edited. This lesson is{" "}
+          <strong>{lesson.status}</strong>.
+        </p>
+      </main>
+    );
+  }
+
+  const editingLesson = lesson;
+  const tutors = membersQ.data?.filter((m) => m.role === "tutor") ?? [];
+
+  async function onSubmit(values: UpdateLessonForm) {
+    setFormError(null);
+    const body = buildUpdateBody(editingLesson, values);
+    if (Object.keys(body).length === 0) {
+      setFormError("Change at least one field.");
+      return;
+    }
+    try {
+      await updateLesson.mutateAsync({ lessonId: editingLesson.id, body });
+      router.push(`${base}/${editingLesson.id}`);
+    } catch (e) {
+      if (isStudiqoApiError(e)) setFormError(e.message);
+      else setFormError("Could not update lesson");
+    }
+  }
+
+  const loadingRefs = subjectsQ.isLoading || membersQ.isLoading;
+
+  return (
+    <main style={{ maxWidth: 480 }}>
+      <p style={{ marginBottom: 16 }}>
+        <Link href={`${base}/${lesson.id}`}>← Lesson</Link>
+      </p>
+      <h1 style={{ fontSize: 22 }}>Edit lesson</h1>
+
+      {loadingRefs ? <p>Loading…</p> : null}
+
+      <form
+        onSubmit={form.handleSubmit(onSubmit)}
+        style={{ display: "flex", flexDirection: "column", gap: 14, marginTop: 16 }}
+      >
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span>Tutor</span>
+          <select
+            {...form.register("tutorId")}
+            style={{ padding: 8, fontSize: 15 }}
+          >
+            {tutors.map((m) => (
+              <option key={m.userId} value={m.userId}>
+                {formatOrgMemberOptionLabel(m)}
+              </option>
+            ))}
+          </select>
+        </label>
+
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span>Subject</span>
+          <select
+            {...form.register("subjectId")}
+            style={{ padding: 8, fontSize: 15 }}
+          >
+            {(subjectsQ.data ?? []).map((s) => (
+              <option key={s.id} value={s.id}>
+                {s.name}
+              </option>
+            ))}
+          </select>
+        </label>
+
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span>Starts</span>
+          <input
+            type="datetime-local"
+            {...form.register("startsAtLocal")}
+            style={{ padding: 8, fontSize: 15 }}
+          />
+        </label>
+
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span>Ends</span>
+          <input
+            type="datetime-local"
+            {...form.register("endsAtLocal")}
+            style={{ padding: 8, fontSize: 15 }}
+          />
+        </label>
+
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span>Notes</span>
+          <textarea
+            {...form.register("notes")}
+            rows={4}
+            style={{ padding: 8, fontSize: 15 }}
+          />
+        </label>
+
+        {form.formState.errors.root ? (
+          <span style={{ color: "#b91c1c", fontSize: 13 }}>
+            {form.formState.errors.root.message}
+          </span>
+        ) : null}
+        {form.formState.errors.endsAtLocal ? (
+          <span style={{ color: "#b91c1c", fontSize: 13 }}>
+            {form.formState.errors.endsAtLocal.message}
+          </span>
+        ) : null}
+
+        {formError ? (
+          <p style={{ color: "#b91c1c", margin: 0 }}>{formError}</p>
+        ) : null}
+
+        <button
+          type="submit"
+          disabled={updateLesson.isPending || loadingRefs}
+          style={{ padding: "10px 14px", fontSize: 15, marginTop: 8 }}
+        >
+          {updateLesson.isPending ? "Saving…" : "Save changes"}
+        </button>
+      </form>
+    </main>
+  );
+}
diff --git a/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/page.tsx b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/page.tsx
new file mode 100644
index 0000000..8c2007b
--- /dev/null
+++ b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/page.tsx
@@ -0,0 +1,5 @@
+import { TenantLessonDetailPage } from "./tenant-lesson-detail-page";
+
+export default function LessonDetailRoutePage() {
+  return <TenantLessonDetailPage />;
+}
diff --git a/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/tenant-lesson-detail-page.tsx b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/tenant-lesson-detail-page.tsx
new file mode 100644
index 0000000..8a53604
--- /dev/null
+++ b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/[lessonId]/tenant-lesson-detail-page.tsx
@@ -0,0 +1,228 @@
+"use client";
+
+import type { components } from "@studiqo/api-client/generated";
+import { isStudiqoApiError } from "@studiqo/api-client/errors";
+import Link from "next/link";
+import { useParams } from "next/navigation";
+import { useMemo, useState } from "react";
+
+import {
+  useCancelLessonMutation,
+  useCompleteLessonMutation,
+  useLessonDetailQuery,
+} from "@/lib/api/lessons-query";
+import { useOrganizationMembersQuery } from "@/lib/api/organization-members-query";
+import { useStudentsListQuery } from "@/lib/api/students-query";
+import { useSubjectsListQuery } from "@/lib/api/subjects-query";
+import { formatIsoDateTime } from "@/lib/datetime";
+import { useTenantOrganizationId } from "@/lib/hooks/use-tenant-organization";
+import { useSession } from "@/lib/auth/session";
+import { isOrgAdminOrSuperadmin } from "@/lib/tenant-role";
+
+type Student = components["schemas"]["Student"];
+type Subject = components["schemas"]["Subject"];
+type OrgMember = components["schemas"]["OrganizationMembership"];
+
+export function TenantLessonDetailPage() {
+  const params = useParams<{ tenantSlug: string; lessonId: string }>();
+  const { tenantSlug, lessonId } = params;
+  const { user } = useSession();
+  const { organizationId, orgsLoading } = useTenantOrganizationId(tenantSlug);
+  const [actionError, setActionError] = useState<string | null>(null);
+
+  const isAdmin = isOrgAdminOrSuperadmin(
+    user?.role,
+    user?.isSuperadmin ?? false,
+  );
+  const isTutor = user?.role === "tutor";
+  const canTryLifecycle = isAdmin || isTutor;
+
+  const lessonQ = useLessonDetailQuery(organizationId, lessonId);
+  const studentsQ = useStudentsListQuery(organizationId);
+  const subjectsQ = useSubjectsListQuery(organizationId);
+  const membersQ = useOrganizationMembersQuery(organizationId, true);
+
+  const completeMut = useCompleteLessonMutation(organizationId ?? "");
+  const cancelMut = useCancelLessonMutation(organizationId ?? "");
+
+  const studentById = useMemo(() => {
+    const m = new Map<string, Student>();
+    for (const s of studentsQ.data ?? []) {
+      m.set(s.id, s);
+    }
+    return m;
+  }, [studentsQ.data]);
+
+  const subjectById = useMemo(() => {
+    const m = new Map<string, Subject>();
+    for (const s of subjectsQ.data ?? []) {
+      m.set(s.id, s);
+    }
+    return m;
+  }, [subjectsQ.data]);
+
+  const memberByUserId = useMemo(() => {
+    const m = new Map<string, OrgMember>();
+    for (const mem of membersQ.data ?? []) {
+      m.set(mem.userId, mem);
+    }
+    return m;
+  }, [membersQ.data]);
+
+  const base = `/t/${tenantSlug}/lessons`;
+  const listUrl = base;
+
+  if (orgsLoading || !organizationId) {
+    return (
+      <main>
+        <p>
+          <Link href={listUrl}>← Lessons</Link>
+        </p>
+        <p>Loading…</p>
+      </main>
+    );
+  }
+
+  if (lessonQ.isLoading) {
+    return (
+      <main>
+        <p>
+          <Link href={listUrl}>← Lessons</Link>
+        </p>
+        <p>Loading lesson…</p>
+      </main>
+    );
+  }
+
+  if (lessonQ.error) {
+    return (
+      <main>
+        <p>
+          <Link href={listUrl}>← Lessons</Link>
+        </p>
+        <p style={{ color: "#b91c1c" }}>
+          {lessonQ.error instanceof Error
+            ? lessonQ.error.message
+            : "Could not load lesson"}
+        </p>
+      </main>
+    );
+  }
+
+  const lesson = lessonQ.data;
+  if (!lesson) {
+    return (
+      <main>
+        <p>
+          <Link href={listUrl}>← Lessons</Link>
+        </p>
+        <p>Lesson not found.</p>
+      </main>
+    );
+  }
+
+  const stu = studentById.get(lesson.studentId);
+  const sub = subjectById.get(lesson.subjectId);
+  const tut = memberByUserId.get(lesson.tutorId);
+  const studentLabel = stu
+    ? `${stu.firstName} ${stu.lastName}`
+    : lesson.studentId;
+  const subjectLabel = sub?.name ?? lesson.subjectId;
+  const tutorLabel = tut?.email ?? lesson.tutorId;
+
+  const terminal = lesson.status === "completed" || lesson.status === "cancelled";
+  const canCompleteOrCancel = canTryLifecycle && !terminal;
+  const mutating = completeMut.isPending || cancelMut.isPending;
+  const lessonIdStable = lesson.id;
+
+  async function onComplete() {
+    setActionError(null);
+    try {
+      await completeMut.mutateAsync(lessonIdStable);
+    } catch (e) {
+      if (isStudiqoApiError(e)) setActionError(e.message);
+      else setActionError("Could not complete lesson");
+    }
+  }
+
+  async function onCancel() {
+    setActionError(null);
+    try {
+      await cancelMut.mutateAsync(lessonIdStable);
+    } catch (e) {
+      if (isStudiqoApiError(e)) setActionError(e.message);
+      else setActionError("Could not cancel lesson");
+    }
+  }
+
+  const canEdit = isAdmin && lesson.status === "scheduled";
+
+  return (
+    <main style={{ maxWidth: 560 }}>
+      <p style={{ marginBottom: 16 }}>
+        <Link href={listUrl}>← Lessons</Link>
+      </p>
+      <h1 style={{ fontSize: 22, marginTop: 0 }}>Lesson</h1>
+      <p style={{ fontSize: 15, opacity: 0.9 }}>
+        <strong>{formatIsoDateTime(lesson.startsAt)}</strong>
+        {" → "}
+        <strong>{formatIsoDateTime(lesson.endsAt)}</strong>
+      </p>
+      <p style={{ fontSize: 15 }}>
+        Status: <strong>{lesson.status}</strong>
+      </p>
+      <ul style={{ fontSize: 15, lineHeight: 1.6, paddingLeft: 20 }}>
+        <li>Student: {studentLabel}</li>
+        <li>Subject: {subjectLabel}</li>
+        <li>Tutor: {tutorLabel}</li>
+        <li>
+          Notes:{" "}
+          {lesson.notes === null || lesson.notes === ""
+            ? "—"
+            : lesson.notes}
+        </li>
+      </ul>
+
+      {canTryLifecycle ? (
+        <div style={{ marginTop: 20, display: "flex", flexWrap: "wrap", gap: 10 }}>
+          <button
+            type="button"
+            onClick={() => void onComplete()}
+            disabled={!canCompleteOrCancel || mutating}
+          >
+            {completeMut.isPending ? "Completing…" : "Mark complete"}
+          </button>
+          <button
+            type="button"
+            onClick={() => void onCancel()}
+            disabled={!canCompleteOrCancel || mutating}
+          >
+            {cancelMut.isPending ? "Cancelling…" : "Cancel lesson"}
+          </button>
+        </div>
+      ) : null}
+
+      {terminal && canTryLifecycle ? (
+        <p style={{ fontSize: 14, opacity: 0.8, marginTop: 12 }}>
+          This lesson is finished; complete and cancel are not available.
+        </p>
+      ) : null}
+
+      {actionError ? (
+        <p style={{ color: "#b91c1c", marginTop: 12 }}>{actionError}</p>
+      ) : null}
+
+      {isAdmin ? (
+        <p style={{ marginTop: 20 }}>
+          {canEdit ? (
+            <Link href={`${base}/${lesson.id}/edit`}>Edit lesson</Link>
+          ) : (
+            <span style={{ fontSize: 14, opacity: 0.85 }}>
+              Only scheduled lessons can be edited.
+            </span>
+          )}
+        </p>
+      ) : null}
+    </main>
+  );
+}
diff --git a/apps/web/app/t/[tenantSlug]/(workspace)/lessons/new/page.tsx b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/new/page.tsx
new file mode 100644
index 0000000..786c28c
--- /dev/null
+++ b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/new/page.tsx
@@ -0,0 +1,5 @@
+import { TenantLessonNewPage } from "./tenant-lesson-new-page";
+
+export default function LessonNewRoutePage() {
+  return <TenantLessonNewPage />;
+}
diff --git a/apps/web/app/t/[tenantSlug]/(workspace)/lessons/new/tenant-lesson-new-page.tsx b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/new/tenant-lesson-new-page.tsx
new file mode 100644
index 0000000..36917f4
--- /dev/null
+++ b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/new/tenant-lesson-new-page.tsx
@@ -0,0 +1,225 @@
+"use client";
+
+import { zodResolver } from "@hookform/resolvers/zod";
+import { isStudiqoApiError } from "@studiqo/api-client/errors";
+import Link from "next/link";
+import { useParams, useRouter } from "next/navigation";
+import { useMemo, useState } from "react";
+import { useForm } from "react-hook-form";
+
+import { useCreateLessonMutation } from "@/lib/api/lessons-query";
+import { useStudentsListQuery } from "@/lib/api/students-query";
+import { useSubjectsListQuery } from "@/lib/api/subjects-query";
+import {
+  parseDatetimeLocalToIso,
+  toDatetimeLocalValue,
+} from "@/lib/datetime";
+import { useTenantOrganizationId } from "@/lib/hooks/use-tenant-organization";
+import { useSession } from "@/lib/auth/session";
+import { isOrgAdminOrSuperadmin } from "@/lib/tenant-role";
+import {
+  createLessonFormSchema,
+  type CreateLessonForm,
+} from "@/lib/validation/lesson-forms";
+
+function defaultLessonTimes(): { start: string; end: string } {
+  const start = new Date();
+  start.setMinutes(0, 0, 0);
+  start.setHours(start.getHours() + 1);
+  const end = new Date(start);
+  end.setHours(end.getHours() + 1);
+  return {
+    start: toDatetimeLocalValue(start),
+    end: toDatetimeLocalValue(end),
+  };
+}
+
+export function TenantLessonNewPage() {
+  const params = useParams<{ tenantSlug: string }>();
+  const tenantSlug = params.tenantSlug;
+  const router = useRouter();
+  const { user } = useSession();
+  const { organizationId, orgsLoading } = useTenantOrganizationId(tenantSlug);
+  const canManage = isOrgAdminOrSuperadmin(
+    user?.role,
+    user?.isSuperadmin ?? false,
+  );
+  const defaults = useMemo(() => defaultLessonTimes(), []);
+  const studentsQ = useStudentsListQuery(organizationId);
+  const subjectsQ = useSubjectsListQuery(organizationId);
+  const createLesson = useCreateLessonMutation(organizationId ?? "");
+  const [formError, setFormError] = useState<string | null>(null);
+
+  const form = useForm<CreateLessonForm>({
+    resolver: zodResolver(createLessonFormSchema),
+    defaultValues: {
+      studentId: "",
+      subjectId: "",
+      startsAtLocal: defaults.start,
+      endsAtLocal: defaults.end,
+    },
+  });
+
+  const studentId = form.watch("studentId");
+  const students = studentsQ.data ?? [];
+  const selectedStudent = students.find((s) => s.id === studentId);
+
+  const base = `/t/${tenantSlug}/lessons`;
+
+  if (!canManage) {
+    return (
+      <main>
+        <h1 style={{ fontSize: 22 }}>New lesson</h1>
+        <p style={{ opacity: 0.85 }}>
+          Only organization admins can create lessons.
+        </p>
+        <p>
+          <Link href={base}>Back to lessons</Link>
+        </p>
+      </main>
+    );
+  }
+
+  if (orgsLoading || !organizationId) {
+    return (
+      <main>
+        <h1 style={{ fontSize: 22 }}>New lesson</h1>
+        <p>Loading…</p>
+      </main>
+    );
+  }
+
+  async function onSubmit(values: CreateLessonForm) {
+    setFormError(null);
+    const tutorId = selectedStudent?.tutorId;
+    if (!tutorId) {
+      setFormError(
+        "This student has no assigned tutor. Assign a tutor on the student before scheduling.",
+      );
+      return;
+    }
+    try {
+      const lesson = await createLesson.mutateAsync({
+        studentId: values.studentId,
+        tutorId,
+        subjectId: values.subjectId,
+        startsAt: parseDatetimeLocalToIso(values.startsAtLocal),
+        endsAt: parseDatetimeLocalToIso(values.endsAtLocal),
+      });
+      router.push(`${base}/${lesson.id}`);
+    } catch (e) {
+      if (isStudiqoApiError(e)) setFormError(e.message);
+      else setFormError("Could not create lesson");
+    }
+  }
+
+  const loadingRefs = studentsQ.isLoading || subjectsQ.isLoading;
+
+  return (
+    <main style={{ maxWidth: 480 }}>
+      <p style={{ marginBottom: 16 }}>
+        <Link href={base}>← Lessons</Link>
+      </p>
+      <h1 style={{ fontSize: 22 }}>New lesson</h1>
+
+      {loadingRefs ? <p>Loading…</p> : null}
+
+      <form
+        onSubmit={form.handleSubmit(onSubmit)}
+        style={{ display: "flex", flexDirection: "column", gap: 14, marginTop: 16 }}
+      >
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span>Student</span>
+          <select
+            {...form.register("studentId")}
+            style={{ padding: 8, fontSize: 15 }}
+          >
+            <option value="">Select student…</option>
+            {students.map((s) => (
+              <option key={s.id} value={s.id}>
+                {s.firstName} {s.lastName}
+              </option>
+            ))}
+          </select>
+          {form.formState.errors.studentId ? (
+            <span style={{ color: "#b91c1c", fontSize: 13 }}>
+              {form.formState.errors.studentId.message}
+            </span>
+          ) : null}
+        </label>
+
+        {selectedStudent && !selectedStudent.tutorId ? (
+          <p style={{ color: "#b45309", fontSize: 14, margin: 0 }}>
+            This student has no tutor assigned. Update the student before
+            creating a lesson.
+          </p>
+        ) : selectedStudent?.tutorId ? (
+          <p style={{ fontSize: 14, opacity: 0.85, margin: 0 }}>
+            Tutor for this lesson is the student&apos;s assigned tutor (set on
+            the student record).
+          </p>
+        ) : null}
+
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span>Subject</span>
+          <select
+            {...form.register("subjectId")}
+            style={{ padding: 8, fontSize: 15 }}
+          >
+            <option value="">Select subject…</option>
+            {(subjectsQ.data ?? []).map((s) => (
+              <option key={s.id} value={s.id}>
+                {s.name}
+              </option>
+            ))}
+          </select>
+          {form.formState.errors.subjectId ? (
+            <span style={{ color: "#b91c1c", fontSize: 13 }}>
+              {form.formState.errors.subjectId.message}
+            </span>
+          ) : null}
+        </label>
+
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span>Starts</span>
+          <input
+            type="datetime-local"
+            {...form.register("startsAtLocal")}
+            style={{ padding: 8, fontSize: 15 }}
+          />
+          {form.formState.errors.startsAtLocal ? (
+            <span style={{ color: "#b91c1c", fontSize: 13 }}>
+              {form.formState.errors.startsAtLocal.message}
+            </span>
+          ) : null}
+        </label>
+
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span>Ends</span>
+          <input
+            type="datetime-local"
+            {...form.register("endsAtLocal")}
+            style={{ padding: 8, fontSize: 15 }}
+          />
+          {form.formState.errors.endsAtLocal ? (
+            <span style={{ color: "#b91c1c", fontSize: 13 }}>
+              {form.formState.errors.endsAtLocal.message}
+            </span>
+          ) : null}
+        </label>
+
+        {formError ? (
+          <p style={{ color: "#b91c1c", margin: 0 }}>{formError}</p>
+        ) : null}
+
+        <button
+          type="submit"
+          disabled={createLesson.isPending || loadingRefs}
+          style={{ padding: "10px 14px", fontSize: 15, marginTop: 8 }}
+        >
+          {createLesson.isPending ? "Creating…" : "Create lesson"}
+        </button>
+      </form>
+    </main>
+  );
+}
diff --git a/apps/web/app/t/[tenantSlug]/(workspace)/lessons/page.tsx b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/page.tsx
new file mode 100644
index 0000000..5af5dd0
--- /dev/null
+++ b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/page.tsx
@@ -0,0 +1,5 @@
+import { TenantLessonsPage } from "./tenant-lessons-page";
+
+export default function LessonsRoutePage() {
+  return <TenantLessonsPage />;
+}
diff --git a/apps/web/app/t/[tenantSlug]/(workspace)/lessons/tenant-lessons-page.tsx b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/tenant-lessons-page.tsx
new file mode 100644
index 0000000..d71d17c
--- /dev/null
+++ b/apps/web/app/t/[tenantSlug]/(workspace)/lessons/tenant-lessons-page.tsx
@@ -0,0 +1,288 @@
+"use client";
+
+import type { components } from "@studiqo/api-client/generated";
+import Link from "next/link";
+import { useParams } from "next/navigation";
+import { useMemo, useState } from "react";
+
+import { useLessonsListQuery } from "@/lib/api/lessons-query";
+import { useOrganizationMembersQuery } from "@/lib/api/organization-members-query";
+import { useStudentsListQuery } from "@/lib/api/students-query";
+import { useSubjectsListQuery } from "@/lib/api/subjects-query";
+import {
+  endOfIsoWeekLocal,
+  formatIsoDateTime,
+  startOfIsoWeekLocal,
+} from "@/lib/datetime";
+import { formatOrgMemberOptionLabel } from "@/lib/format-org-member";
+import { useTenantOrganizationId } from "@/lib/hooks/use-tenant-organization";
+import { useSession } from "@/lib/auth/session";
+import { isOrgAdminOrSuperadmin } from "@/lib/tenant-role";
+import { lessonListRangeSchema } from "@/lib/validation/lesson-forms";
+
+type Student = components["schemas"]["Student"];
+type Subject = components["schemas"]["Subject"];
+type OrgMember = components["schemas"]["OrganizationMembership"];
+
+function addDays(d: Date, n: number): Date {
+  const x = new Date(d);
+  x.setDate(x.getDate() + n);
+  return x;
+}
+
+export function TenantLessonsPage() {
+  const params = useParams<{ tenantSlug: string }>();
+  const tenantSlug = params.tenantSlug;
+  const { user } = useSession();
+  const { organizationId, orgsLoading } = useTenantOrganizationId(tenantSlug);
+  const [weekAnchor, setWeekAnchor] = useState(() => new Date());
+  const [studentFilter, setStudentFilter] = useState("");
+  const [tutorFilter, setTutorFilter] = useState("");
+
+  const isAdmin = isOrgAdminOrSuperadmin(
+    user?.role,
+    user?.isSuperadmin ?? false,
+  );
+  const canUseTutorFilter = isAdmin;
+
+  const fromDate = useMemo(() => startOfIsoWeekLocal(weekAnchor), [weekAnchor]);
+  const toDate = useMemo(() => endOfIsoWeekLocal(weekAnchor), [weekAnchor]);
+  const fromIso = fromDate.toISOString();
+  const toIso = toDate.toISOString();
+
+  const rangeParsed = lessonListRangeSchema.safeParse({ fromIso, toIso });
+  const rangeValid = rangeParsed.success;
+
+  const listFilters =
+    rangeValid && organizationId
+      ? {
+          from: fromIso,
+          to: toIso,
+          ...(studentFilter ? { studentId: studentFilter } : {}),
+          ...(canUseTutorFilter && tutorFilter ? { tutorId: tutorFilter } : {}),
+        }
+      : null;
+
+  const studentsQ = useStudentsListQuery(organizationId);
+  const subjectsQ = useSubjectsListQuery(organizationId);
+  const membersQ = useOrganizationMembersQuery(organizationId, canUseTutorFilter);
+  const lessonsQ = useLessonsListQuery(organizationId, listFilters, rangeValid);
+
+  const studentById = useMemo(() => {
+    const m = new Map<string, Student>();
+    for (const s of studentsQ.data ?? []) {
+      m.set(s.id, s);
+    }
+    return m;
+  }, [studentsQ.data]);
+
+  const subjectById = useMemo(() => {
+    const m = new Map<string, Subject>();
+    for (const s of subjectsQ.data ?? []) {
+      m.set(s.id, s);
+    }
+    return m;
+  }, [subjectsQ.data]);
+
+  const tutorByUserId = useMemo(() => {
+    const m = new Map<string, OrgMember>();
+    for (const mem of membersQ.data ?? []) {
+      if (mem.role === "tutor") {
+        m.set(mem.userId, mem);
+      }
+    }
+    return m;
+  }, [membersQ.data]);
+
+  const sortedLessons = useMemo(() => {
+    const list = lessonsQ.data ?? [];
+    return [...list].sort(
+      (a, b) =>
+        new Date(a.startsAt).getTime() - new Date(b.startsAt).getTime(),
+    );
+  }, [lessonsQ.data]);
+
+  const base = `/t/${tenantSlug}/lessons`;
+  const tutors = membersQ.data?.filter((m) => m.role === "tutor") ?? [];
+
+  if (orgsLoading || !organizationId) {
+    return (
+      <main>
+        <h1 style={{ fontSize: 22 }}>Lessons</h1>
+        <p>Loading…</p>
+      </main>
+    );
+  }
+
+  return (
+    <main>
+      <div
+        style={{
+          display: "flex",
+          flexWrap: "wrap",
+          gap: 12,
+          alignItems: "baseline",
+          justifyContent: "space-between",
+        }}
+      >
+        <h1 style={{ fontSize: 22, margin: 0 }}>Lessons</h1>
+        {isAdmin ? (
+          <Link href={`${base}/new`} style={{ fontSize: 15 }}>
+            New lesson
+          </Link>
+        ) : null}
+      </div>
+
+      <section
+        style={{
+          marginTop: 16,
+          display: "flex",
+          flexWrap: "wrap",
+          gap: 12,
+          alignItems: "center",
+        }}
+      >
+        <span style={{ fontSize: 14, opacity: 0.85 }}>Week</span>
+        <button
+          type="button"
+          onClick={() => setWeekAnchor((d) => addDays(d, -7))}
+          style={{ fontSize: 14 }}
+        >
+          Previous
+        </button>
+        <button
+          type="button"
+          onClick={() => setWeekAnchor(new Date())}
+          style={{ fontSize: 14 }}
+        >
+          This week
+        </button>
+        <button
+          type="button"
+          onClick={() => setWeekAnchor((d) => addDays(d, 7))}
+          style={{ fontSize: 14 }}
+        >
+          Next
+        </button>
+        <span style={{ fontSize: 13, opacity: 0.75 }}>
+          {formatIsoDateTime(fromIso)} – {formatIsoDateTime(toIso)}
+        </span>
+      </section>
+
+      {!rangeValid ? (
+        <p style={{ color: "#b91c1c", marginTop: 12 }}>
+          {rangeParsed.success ? null : rangeParsed.error.issues[0]?.message}
+        </p>
+      ) : null}
+
+      <div
+        style={{
+          marginTop: 16,
+          display: "flex",
+          flexWrap: "wrap",
+          gap: 16,
+          alignItems: "flex-end",
+        }}
+      >
+        <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+          <span style={{ fontSize: 13 }}>Student</span>
+          <select
+            value={studentFilter}
+            onChange={(e) => setStudentFilter(e.target.value)}
+            style={{ minWidth: 200, fontSize: 14 }}
+          >
+            <option value="">All</option>
+            {(studentsQ.data ?? []).map((s) => (
+              <option key={s.id} value={s.id}>
+                {s.firstName} {s.lastName}
+              </option>
+            ))}
+          </select>
+        </label>
+        {canUseTutorFilter ? (
+          <label style={{ display: "flex", flexDirection: "column", gap: 4 }}>
+            <span style={{ fontSize: 13 }}>Tutor</span>
+            <select
+              value={tutorFilter}
+              onChange={(e) => setTutorFilter(e.target.value)}
+              style={{ minWidth: 220, fontSize: 14 }}
+            >
+              <option value="">All</option>
+              {tutors.map((t) => (
+                <option key={t.userId} value={t.userId}>
+                  {formatOrgMemberOptionLabel(t)}
+                </option>
+              ))}
+            </select>
+          </label>
+        ) : null}
+      </div>
+
+      {studentsQ.isLoading || subjectsQ.isLoading || membersQ.isLoading ? (
+        <p style={{ marginTop: 16 }}>Loading filters…</p>
+      ) : null}
+
+      {lessonsQ.isLoading ? <p style={{ marginTop: 16 }}>Loading lessons…</p> : null}
+      {lessonsQ.error ? (
+        <p style={{ color: "#b91c1c", marginTop: 16 }}>
+          {lessonsQ.error instanceof Error
+            ? lessonsQ.error.message
+            : "Could not load lessons"}
+        </p>
+      ) : null}
+
+      {!lessonsQ.isLoading &&
+      !lessonsQ.error &&
+      rangeValid &&
+      sortedLessons.length === 0 ? (
+        <p style={{ opacity: 0.85, marginTop: 16 }}>
+          No lessons in this range.
+          {isAdmin ? (
+            <>
+              {" "}
+              <Link href={`${base}/new`}>Schedule one</Link>.
+            </>
+          ) : null}
+        </p>
+      ) : null}
+
+      {!lessonsQ.isLoading && !lessonsQ.error && sortedLessons.length > 0 ? (
+        <ul style={{ listStyle: "none", padding: 0, marginTop: 16 }}>
+          {sortedLessons.map((lesson) => {
+            const stu = studentById.get(lesson.studentId);
+            const sub = subjectById.get(lesson.subjectId);
+            const tut = tutorByUserId.get(lesson.tutorId);
+            const studentLabel = stu
+              ? `${stu.firstName} ${stu.lastName}`
+              : lesson.studentId;
+            const subjectLabel = sub?.name ?? lesson.subjectId;
+            const tutorLabel = tut?.email ?? lesson.tutorId;
+            return (
+              <li
+                key={lesson.id}
+                style={{
+                  borderBottom: "1px solid #eee",
+                  padding: "12px 0",
+                }}
+              >
+                <Link
+                  href={`${base}/${lesson.id}`}
+                  style={{ fontSize: 16, fontWeight: 600 }}
+                >
+                  {formatIsoDateTime(lesson.startsAt)} →{" "}
+                  {formatIsoDateTime(lesson.endsAt)}
+                </Link>
+                <div style={{ fontSize: 14, opacity: 0.85, marginTop: 4 }}>
+                  {studentLabel} · {subjectLabel} · {tutorLabel}
+                </div>
+                <div style={{ fontSize: 13, marginTop: 4 }}>
+                  Status: <strong>{lesson.status}</strong>
+                </div>
+              </li>
+            );
+          })}
+        </ul>
+      ) : null}
+    </main>
+  );
+}
diff --git a/apps/web/app/t/[tenantSlug]/(workspace)/page.tsx b/apps/web/app/t/[tenantSlug]/(workspace)/page.tsx
index a688dce..6461132 100644
--- a/apps/web/app/t/[tenantSlug]/(workspace)/page.tsx
+++ b/apps/web/app/t/[tenantSlug]/(workspace)/page.tsx
@@ -8,9 +8,10 @@ export default async function TenantHomePage({ params }: PageProps) {
     <main>
       <h1 style={{ fontSize: 22 }}>Workspace</h1>
       <p style={{ fontSize: 15, opacity: 0.85 }}>
-        You are in <strong>{tenantSlug}</strong>. Manage students from{" "}
-        <Link href={`/t/${tenantSlug}/students`}>Students</Link>. Lesson tools
-        arrive in Phase 3.
+        You are in <strong>{tenantSlug}</strong>. Open{" "}
+        <Link href={`/t/${tenantSlug}/students`}>Students</Link> or{" "}
+        <Link href={`/t/${tenantSlug}/lessons`}>Lessons</Link> to work in this
+        organization.
       </p>
     </main>
   );
diff --git a/apps/web/components/tenant-nav.tsx b/apps/web/components/tenant-nav.tsx
index 44737a2..c3ac334 100644
--- a/apps/web/components/tenant-nav.tsx
+++ b/apps/web/components/tenant-nav.tsx
@@ -16,7 +16,7 @@ export function TenantNav({
   isSuperadmin: boolean;
 }) {
   const base = `/t/${tenantSlug}`;
-  const showStudentsLink =
+  const showStudentsAndLessons =
     role === "org_admin" ||
     role === "tutor" ||
     role === "parent" ||
@@ -25,9 +25,12 @@ export function TenantNav({
   return (
     <nav style={{ display: "flex", gap: 16, fontSize: 14, padding: "8px 0" }}>
       <Link href={base}>Home</Link>
-      {showStudentsLink ? (
+      {showStudentsAndLessons ? (
         <Link href={`${base}/students`}>Students</Link>
       ) : null}
+      {showStudentsAndLessons ? (
+        <Link href={`${base}/lessons`}>Lessons</Link>
+      ) : null}
       {role === "org_admin" || isSuperadmin ? (
         <Link href={`${base}/invites`}>Invites</Link>
       ) : null}
diff --git a/apps/web/lib/api/lessons-query.ts b/apps/web/lib/api/lessons-query.ts
new file mode 100644
index 0000000..7f74c96
--- /dev/null
+++ b/apps/web/lib/api/lessons-query.ts
@@ -0,0 +1,195 @@
+"use client";
+
+import type { components } from "@studiqo/api-client/generated";
+import { unwrapStudiqoResponse } from "@studiqo/api-client/errors";
+import {
+  useMutation,
+  useQuery,
+  useQueryClient,
+  type QueryClient,
+} from "@tanstack/react-query";
+
+import { useSession } from "@/lib/auth/session";
+
+export type LessonsListFilters = {
+  from: string;
+  to: string;
+  studentId?: string;
+  tutorId?: string;
+};
+
+export const lessonsListQueryKey = (
+  organizationId: string,
+  filters: LessonsListFilters,
+) =>
+  [
+    "lessons",
+    organizationId,
+    "list",
+    filters.from,
+    filters.to,
+    filters.studentId ?? "",
+    filters.tutorId ?? "",
+  ] as const;
+
+export const lessonDetailQueryKey = (lessonId: string) =>
+  ["lessons", lessonId, "detail"] as const;
+
+type CreateLessonBody = components["schemas"]["CreateLessonRequest"];
+type UpdateLessonBody = components["schemas"]["UpdateLessonRequest"];
+
+function enabledWorkspace(
+  organizationId: string | null,
+  authStatus: string,
+  accessToken: string | null,
+): boolean {
+  return (
+    Boolean(organizationId) &&
+    authStatus === "authenticated" &&
+    Boolean(accessToken)
+  );
+}
+
+export function invalidateLessonQueriesForOrg(
+  queryClient: QueryClient,
+  organizationId: string,
+): void {
+  void queryClient.invalidateQueries({
+    predicate: (q) =>
+      Array.isArray(q.queryKey) &&
+      q.queryKey[0] === "lessons" &&
+      q.queryKey[1] === organizationId,
+  });
+}
+
+export function useLessonsListQuery(
+  organizationId: string | null,
+  filters: LessonsListFilters | null,
+  rangeValid: boolean,
+) {
+  const { apiClient, authStatus, accessToken } = useSession();
+  return useQuery({
+    queryKey:
+      organizationId && filters && rangeValid
+        ? lessonsListQueryKey(organizationId, filters)
+        : ["lessons", "list", "disabled"],
+    queryFn: async () => {
+      const r = await apiClient.GET("/lessons", {
+        params: {
+          query: {
+            from: filters!.from,
+            to: filters!.to,
+            ...(filters!.studentId ? { studentId: filters!.studentId } : {}),
+            ...(filters!.tutorId ? { tutorId: filters!.tutorId } : {}),
+          },
+        },
+      });
+      return unwrapStudiqoResponse(r);
+    },
+    enabled:
+      enabledWorkspace(organizationId, authStatus, accessToken) &&
+      Boolean(filters) &&
+      rangeValid,
+  });
+}
+
+export function useLessonDetailQuery(
+  organizationId: string | null,
+  lessonId: string | null,
+) {
+  const { apiClient, authStatus, accessToken } = useSession();
+  return useQuery({
+    queryKey: lessonId
+      ? lessonDetailQueryKey(lessonId)
+      : ["lessons", "detail", "disabled"],
+    queryFn: async () => {
+      const r = await apiClient.GET("/lessons/{lessonId}", {
+        params: { path: { lessonId: lessonId! } },
+      });
+      return unwrapStudiqoResponse(r);
+    },
+    enabled:
+      enabledWorkspace(organizationId, authStatus, accessToken) &&
+      Boolean(lessonId),
+  });
+}
+
+export function useCreateLessonMutation(organizationId: string) {
+  const { apiClient } = useSession();
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: async (body: CreateLessonBody) => {
+      const r = await apiClient.POST("/lessons", { body });
+      return unwrapStudiqoResponse(r);
+    },
+    onSuccess: () => {
+      invalidateLessonQueriesForOrg(queryClient, organizationId);
+    },
+  });
+}
+
+export function useUpdateLessonMutation(organizationId: string) {
+  const { apiClient } = useSession();
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: async ({
+      lessonId,
+      body,
+    }: {
+      lessonId: string;
+      body: UpdateLessonBody;
+    }) => {
+      const r = await apiClient.PUT("/lessons/{lessonId}", {
+        params: { path: { lessonId } },
+        body,
+      });
+      return unwrapStudiqoResponse(r);
+    },
+    onSuccess: (_data, { lessonId }) => {
+      invalidateLessonQueriesForOrg(queryClient, organizationId);
+      void queryClient.invalidateQueries({
+        queryKey: lessonDetailQueryKey(lessonId),
+      });
+    },
+  });
+}
+
+export function useCompleteLessonMutation(organizationId: string) {
+  const { apiClient } = useSession();
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: async (lessonId: string) => {
+      const r = await apiClient.POST("/lessons/{lessonId}/complete", {
+        params: { path: { lessonId } },
+        body: {},
+      });
+      return unwrapStudiqoResponse(r);
+    },
+    onSuccess: (_data, lessonId) => {
+      invalidateLessonQueriesForOrg(queryClient, organizationId);
+      void queryClient.invalidateQueries({
+        queryKey: lessonDetailQueryKey(lessonId),
+      });
+    },
+  });
+}
+
+export function useCancelLessonMutation(organizationId: string) {
+  const { apiClient } = useSession();
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: async (lessonId: string) => {
+      const r = await apiClient.POST("/lessons/{lessonId}/cancel", {
+        params: { path: { lessonId } },
+        body: {},
+      });
+      return unwrapStudiqoResponse(r);
+    },
+    onSuccess: (_data, lessonId) => {
+      invalidateLessonQueriesForOrg(queryClient, organizationId);
+      void queryClient.invalidateQueries({
+        queryKey: lessonDetailQueryKey(lessonId),
+      });
+    },
+  });
+}
diff --git a/apps/web/lib/datetime.ts b/apps/web/lib/datetime.ts
index df0aa2e..c49a904 100644
--- a/apps/web/lib/datetime.ts
+++ b/apps/web/lib/datetime.ts
@@ -37,3 +37,37 @@ export function formatIsoDateTime(
     timeZone,
   }).format(d);
 }
+
+/** Monday 00:00:00.000 in the user's local timezone. */
+export function startOfIsoWeekLocal(ref = new Date()): Date {
+  const d = new Date(ref);
+  const day = d.getDay();
+  const mondayOffset = day === 0 ? -6 : 1 - day;
+  d.setDate(d.getDate() + mondayOffset);
+  d.setHours(0, 0, 0, 0);
+  return d;
+}
+
+/** Sunday 23:59:59.999 local, for the week that contains `ref`. */
+export function endOfIsoWeekLocal(ref = new Date()): Date {
+  const start = startOfIsoWeekLocal(ref);
+  const end = new Date(start);
+  end.setDate(start.getDate() + 6);
+  end.setHours(23, 59, 59, 999);
+  return end;
+}
+
+/** Value for `<input type="datetime-local" />` in local time. */
+export function toDatetimeLocalValue(d: Date): string {
+  const pad = (n: number) => String(n).padStart(2, "0");
+  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}T${pad(d.getHours())}:${pad(d.getMinutes())}`;
+}
+
+/** Parse `datetime-local` string (no timezone) as local instant → ISO UTC for the API. */
+export function parseDatetimeLocalToIso(local: string): string {
+  const d = new Date(local);
+  if (Number.isNaN(d.getTime())) {
+    throw new RangeError(`Invalid datetime-local: ${local}`);
+  }
+  return d.toISOString();
+}
diff --git a/apps/web/lib/validation/lesson-forms.ts b/apps/web/lib/validation/lesson-forms.ts
new file mode 100644
index 0000000..fc8ca5a
--- /dev/null
+++ b/apps/web/lib/validation/lesson-forms.ts
@@ -0,0 +1,79 @@
+import { z } from "zod";
+
+const uuid = z.string().uuid();
+
+export const lessonListRangeSchema = z
+  .object({
+    fromIso: z.string().min(1),
+    toIso: z.string().min(1),
+  })
+  .refine(
+    (d) => {
+      const a = new Date(d.fromIso).getTime();
+      const b = new Date(d.toIso).getTime();
+      return !Number.isNaN(a) && !Number.isNaN(b) && b > a;
+    },
+    { message: "End must be after start", path: ["toIso"] },
+  );
+
+export type LessonListRange = z.infer<typeof lessonListRangeSchema>;
+
+export const createLessonFormSchema = z
+  .object({
+    studentId: uuid,
+    subjectId: uuid,
+    startsAtLocal: z.string().min(1, "Start is required"),
+    endsAtLocal: z.string().min(1, "End is required"),
+  })
+  .refine(
+    (d) => {
+      const s = new Date(d.startsAtLocal).getTime();
+      const e = new Date(d.endsAtLocal).getTime();
+      return !Number.isNaN(s) && !Number.isNaN(e) && e > s;
+    },
+    { message: "End must be after start", path: ["endsAtLocal"] },
+  );
+
+export type CreateLessonForm = z.infer<typeof createLessonFormSchema>;
+
+export const updateLessonFormSchema = z
+  .object({
+    tutorId: z.union([uuid, z.literal("")]).optional(),
+    subjectId: z.union([uuid, z.literal("")]).optional(),
+    startsAtLocal: z.string().optional(),
+    endsAtLocal: z.string().optional(),
+    notes: z.string().optional(),
+  })
+  .refine(
+    (data) => {
+      const hasTutor = data.tutorId !== undefined && data.tutorId !== "";
+      const hasSubject = data.subjectId !== undefined && data.subjectId !== "";
+      const hasStart =
+        data.startsAtLocal !== undefined && data.startsAtLocal.trim() !== "";
+      const hasEnd =
+        data.endsAtLocal !== undefined && data.endsAtLocal.trim() !== "";
+      const hasNotes = data.notes !== undefined;
+      return hasTutor || hasSubject || hasStart || hasEnd || hasNotes;
+    },
+    { message: "Change at least one field" },
+  )
+  .refine(
+    (data) => {
+      const hasStart =
+        data.startsAtLocal !== undefined && data.startsAtLocal.trim() !== "";
+      const hasEnd =
+        data.endsAtLocal !== undefined && data.endsAtLocal.trim() !== "";
+      if (hasStart !== hasEnd) {
+        return false;
+      }
+      if (!hasStart || !hasEnd) {
+        return true;
+      }
+      const s = new Date(data.startsAtLocal!).getTime();
+      const e = new Date(data.endsAtLocal!).getTime();
+      return !Number.isNaN(s) && !Number.isNaN(e) && e > s;
+    },
+    { message: "End must be after start", path: ["endsAtLocal"] },
+  );
+
+export type UpdateLessonForm = z.infer<typeof updateLessonFormSchema>;