diff --git a/.changeset/source-section-field.md b/.changeset/source-section-field.md
new file mode 100644
index 0000000000..e37cc5c64d
--- /dev/null
+++ b/.changeset/source-section-field.md
@@ -0,0 +1,12 @@
+---
+"@hyperdx/common-utils": patch
+"@hyperdx/api": patch
+"@hyperdx/app": patch
+---
+
+feat: add an optional Section field to data sources
+
+Sources can now carry an optional free-text Section label, set from the source
+settings form. The value is persisted and returned by GET /api/v2/sources, so
+external API consumers can read it. This lays the groundwork for grouping and
+searching sources by section in the source selector.
diff --git a/packages/api/openapi.json b/packages/api/openapi.json
index 9bcad76117..a2b81197ce 100644
--- a/packages/api/openapi.json
+++ b/packages/api/openapi.json
@@ -2951,6 +2951,12 @@
             "description": "Display name for the source.",
             "example": "Logs"
           },
+          "section": {
+            "type": "string",
+            "maxLength": 256,
+            "description": "Optional grouping label used to organize sources in the source selector. Sources that share a section value are displayed together.",
+            "example": "Billing"
+          },
           "kind": {
             "type": "string",
             "enum": [
@@ -3139,6 +3145,12 @@
             "description": "Display name for the source.",
             "example": "Traces"
           },
+          "section": {
+            "type": "string",
+            "maxLength": 256,
+            "description": "Optional grouping label used to organize sources in the source selector. Sources that share a section value are displayed together.",
+            "example": "Billing"
+          },
           "kind": {
             "type": "string",
             "enum": [
@@ -3354,6 +3366,12 @@
             "description": "Display name for the source.",
             "example": "Metrics"
           },
+          "section": {
+            "type": "string",
+            "maxLength": 256,
+            "description": "Optional grouping label used to organize sources in the source selector. Sources that share a section value are displayed together.",
+            "example": "Billing"
+          },
           "kind": {
             "type": "string",
             "enum": [
@@ -3422,6 +3440,12 @@
             "description": "Display name for the source.",
             "example": "Sessions"
           },
+          "section": {
+            "type": "string",
+            "maxLength": 256,
+            "description": "Optional grouping label used to organize sources in the source selector. Sources that share a section value are displayed together.",
+            "example": "Billing"
+          },
           "kind": {
             "type": "string",
             "enum": [
diff --git a/packages/api/src/models/source.ts b/packages/api/src/models/source.ts
index b7e7d55d33..7623af007b 100644
--- a/packages/api/src/models/source.ts
+++ b/packages/api/src/models/source.ts
@@ -91,6 +91,7 @@ const sourceBaseSchema = new Schema<MongooseSourceBase>(
       ref: 'Connection',
     },
     name: String,
+    section: String,
     disabled: {
       type: Boolean,
       default: false,
diff --git a/packages/api/src/routers/external-api/__tests__/sources.test.ts b/packages/api/src/routers/external-api/__tests__/sources.test.ts
index 91a7296ff0..dfe3d59494 100644
--- a/packages/api/src/routers/external-api/__tests__/sources.test.ts
+++ b/packages/api/src/routers/external-api/__tests__/sources.test.ts
@@ -533,6 +533,54 @@ describe('External API v2 Sources', () => {
       expect(response.body.data).toHaveLength(1);
       expect(response.body.data[0].id).toBe(validSource._id.toString());
     });
+
+    describe('section field', () => {
+      const SECTION = 'Control Plane Prod';
+
+      it('returns the section on a source that has one', async () => {
+        const logSource = await LogSource.create({
+          kind: SourceKind.Log,
+          team: team._id,
+          name: 'Sectioned Log Source',
+          section: SECTION,
+          from: {
+            databaseName: DEFAULT_DATABASE,
+            tableName: DEFAULT_LOGS_TABLE,
+          },
+          timestampValueExpression: 'Timestamp',
+          defaultTableSelectExpression: '*',
+          connection: connection._id,
+        });
+
+        const response = await authRequest('get', BASE_URL).expect(200);
+
+        expect(response.body.data).toHaveLength(1);
+        expect(response.body.data[0]).toMatchObject({
+          id: logSource._id.toString(),
+          section: SECTION,
+        });
+      });
+
+      it('omits the section on a source that has none', async () => {
+        await LogSource.create({
+          kind: SourceKind.Log,
+          team: team._id,
+          name: 'Unsectioned Log Source',
+          from: {
+            databaseName: DEFAULT_DATABASE,
+            tableName: DEFAULT_LOGS_TABLE,
+          },
+          timestampValueExpression: 'Timestamp',
+          defaultTableSelectExpression: '*',
+          connection: connection._id,
+        });
+
+        const response = await authRequest('get', BASE_URL).expect(200);
+
+        expect(response.body.data).toHaveLength(1);
+        expect(response.body.data[0]).not.toHaveProperty('section');
+      });
+    });
   });
 
   describe('backward compatibility with legacy flat-model documents', () => {
diff --git a/packages/api/src/routers/external-api/v2/sources.ts b/packages/api/src/routers/external-api/v2/sources.ts
index 0903dccf0e..106c9a4c76 100644
--- a/packages/api/src/routers/external-api/v2/sources.ts
+++ b/packages/api/src/routers/external-api/v2/sources.ts
@@ -274,6 +274,11 @@ function formatExternalSource(source: SourceDocument) {
  *           type: string
  *           description: Display name for the source.
  *           example: Logs
+ *         section:
+ *           type: string
+ *           maxLength: 256
+ *           description: Optional grouping label used to organize sources in the source selector. Sources that share a section value are displayed together.
+ *           example: Billing
  *         kind:
  *           type: string
  *           enum: [log]
@@ -421,6 +426,11 @@ function formatExternalSource(source: SourceDocument) {
  *           type: string
  *           description: Display name for the source.
  *           example: Traces
+ *         section:
+ *           type: string
+ *           maxLength: 256
+ *           description: Optional grouping label used to organize sources in the source selector. Sources that share a section value are displayed together.
+ *           example: Billing
  *         kind:
  *           type: string
  *           enum: [trace]
@@ -589,6 +599,11 @@ function formatExternalSource(source: SourceDocument) {
  *           type: string
  *           description: Display name for the source.
  *           example: Metrics
+ *         section:
+ *           type: string
+ *           maxLength: 256
+ *           description: Optional grouping label used to organize sources in the source selector. Sources that share a section value are displayed together.
+ *           example: Billing
  *         kind:
  *           type: string
  *           enum: [metric]
@@ -641,6 +656,11 @@ function formatExternalSource(source: SourceDocument) {
  *           type: string
  *           description: Display name for the source.
  *           example: Sessions
+ *         section:
+ *           type: string
+ *           maxLength: 256
+ *           description: Optional grouping label used to organize sources in the source selector. Sources that share a section value are displayed together.
+ *           example: Billing
  *         kind:
  *           type: string
  *           enum: [session]
diff --git a/packages/app/src/components/Sources/SourceForm.tsx b/packages/app/src/components/Sources/SourceForm.tsx
index 6c4043afb1..308b81fd6a 100644
--- a/packages/app/src/components/Sources/SourceForm.tsx
+++ b/packages/app/src/components/Sources/SourceForm.tsx
@@ -2447,6 +2447,14 @@ export function TableSourceForm({
             rules={{ required: 'Name is required' }}
           />
         </FormRow>
+        <FormRow label={'Section'}>
+          <InputControlled
+            control={control}
+            name="section"
+            placeholder="Optional group, e.g. Billing or Control Plane Prod"
+            maxLength={256}
+          />
+        </FormRow>
         <FormRow label={'Source Data Type'}>
           <Controller
             control={control}
diff --git a/packages/common-utils/src/types.ts b/packages/common-utils/src/types.ts
index 95c0f157df..92062970ba 100644
--- a/packages/common-utils/src/types.ts
+++ b/packages/common-utils/src/types.ts
@@ -1582,6 +1582,7 @@ const RequiredTimestampColumnSchema = z
 export const BaseSourceSchema = z.object({
   id: z.string(),
   name: z.string().min(1, 'Name is required'),
+  section: z.string().max(256).optional(),
   kind: z.nativeEnum(SourceKind),
   connection: z.string().min(1, 'Server Connection is required'),
   from: z.object({