diff --git a/pkg/cmd/sandbox.go b/pkg/cmd/sandbox.go
index 5d727dbc..54c4d83c 100644
--- a/pkg/cmd/sandbox.go
+++ b/pkg/cmd/sandbox.go
@@ -75,6 +75,7 @@ func newSandboxCmd() *sandboxCmd {
 	// server-side (the UAT allowlist + hzn_sandbox_create), not the client.
 	sc.cmd.AddCommand(newSandboxNewCmd().cmd)
 	sc.cmd.AddCommand(newSandboxListCmd().cmd)
+	sc.cmd.AddCommand(newSandboxDeleteCmd().cmd)
 	return sc
 }
 
@@ -434,6 +435,13 @@ type sandboxListCmd struct {
 	apiBase       string
 }
 
+type sandboxDeleteCmd struct {
+	cmd           *cobra.Command
+	stripeAccount string
+	stripeVersion string
+	apiBase       string
+}
+
 func newSandboxClaimCmd() *sandboxClaimCmd {
 	scc := &sandboxClaimCmd{}
 	scc.cmd = &cobra.Command{
@@ -1019,6 +1027,176 @@ func (slc *sandboxListCmd) runSandboxListCmd(cmd *cobra.Command, args []string)
 	return nil
 }
 
+func newSandboxDeleteCmd() *sandboxDeleteCmd {
+	sdc := &sandboxDeleteCmd{}
+	sdc.cmd = &cobra.Command{
+		Use:   "delete",
+		Short: "Delete a sandbox by its account id",
+		Long: `Delete a sandbox created for the logged-in account.
+
+Deletes the sandbox whose account (acct_...) you pass via --stripe-account (the
+ACCOUNT shown by ` + "`stripe sandbox list`" + `). This closes the sandbox's testmode
+workspace, mirroring the dashboard's delete action; it never touches your live account.`,
+		Args:   validators.NoArgs,
+		RunE:   sdc.runSandboxDeleteCmd,
+		Hidden: true,
+	}
+
+	sdc.cmd.Flags().StringVar(&sdc.stripeAccount, "stripe-account", "", "Account (acct_...) of the sandbox to delete; see `stripe sandbox list`")
+	_ = sdc.cmd.MarkFlagRequired("stripe-account")
+
+	sdc.cmd.Flags().StringVar(&sdc.stripeVersion, "stripe-version", requests.StripeVersionHeaderValue, "Sets the Stripe-Version header")
+	_ = sdc.cmd.Flags().MarkHidden("stripe-version")
+
+	sdc.cmd.Flags().StringVar(&sdc.apiBase, "api-base", stripe.DefaultAPIBaseURL, "Sets the Stripe API base URL")
+	_ = sdc.cmd.Flags().MarkHidden("api-base")
+
+	return sdc
+}
+
+func (sdc *sandboxDeleteCmd) runSandboxDeleteCmd(cmd *cobra.Command, args []string) error {
+	if config.KeyRing == nil {
+		return fmt.Errorf("credential store unavailable; run `stripe login` first")
+	}
+	uatBytes, err := config.KeyRing.Get(config.UATKeychainItemKey)
+	if err != nil || len(uatBytes) == 0 {
+		return fmt.Errorf("no user access token found; run `stripe login` first")
+	}
+	uat := strings.TrimSpace(string(uatBytes))
+
+	// --stripe-account names the sandbox to delete (its acct_), consistent with the
+	// acct_-centric selector on `new`/`list`. Never an org.
+	stripeAccount := strings.TrimSpace(sdc.stripeAccount)
+	switch {
+	case stripeAccount == "":
+		return fmt.Errorf("--stripe-account is required (the acct_ of the sandbox to delete; see `stripe sandbox list`)")
+	case strings.HasPrefix(stripeAccount, "org_"):
+		return fmt.Errorf("--stripe-account must be an account (acct_...), not an organization (org_...)")
+	case !strings.HasPrefix(stripeAccount, "acct_"):
+		return fmt.Errorf("--stripe-account must be an account id (acct_...), got %q", stripeAccount)
+	}
+
+	baseURL, err := url.Parse(sdc.apiBase)
+	if err != nil {
+		return fmt.Errorf("invalid --api-base %q: %w", sdc.apiBase, err)
+	}
+
+	// Empty APIKey so no Bearer header is set; the UAT is injected as STRIPE-V2-SIG.
+	client := &stripe.Client{
+		BaseURL: baseURL,
+		APIKey:  "",
+	}
+	authConfigure := func(req *http.Request) error {
+		req.Header.Set("Authorization", "STRIPE-V2-SIG "+uat)
+		req.Header.Set("Stripe-Version", sdc.stripeVersion)
+		req.Header.Set("Content-Type", stripe.V2ContentType)
+		return nil
+	}
+
+	// The delete endpoint takes the sandbox's testmode workspace (wksp_test). We only have
+	// its account (acct_), so resolve acct_ -> wksp_test by finding the sandbox under the
+	// caller's accessible live parents.
+	sandboxWorkspace, sandboxName, err := resolveSandboxWorkspaceByAccount(cmd.Context(), client, authConfigure, stripeAccount)
+	if err != nil {
+		return err
+	}
+	// Guard: only ever close a sandbox (testmode) workspace, never something else.
+	if !strings.HasPrefix(sandboxWorkspace, "wksp_test") {
+		return fmt.Errorf("resolved sandbox id %q is not a testmode workspace (wksp_test...)", sandboxWorkspace)
+	}
+
+	if sandboxName != "" {
+		fmt.Fprintf(cmd.ErrOrStderr(), "Deleting sandbox %q (%s)\n", sandboxName, stripeAccount)
+	} else {
+		fmt.Fprintf(cmd.ErrOrStderr(), "Deleting sandbox %s\n", stripeAccount)
+	}
+
+	// Close the testmode workspace, mirroring the dashboard's v2CloseTestmodeWorkspace
+	// mutation. The workspace id is in the path; the call is self-scoped by the UAT (no
+	// Stripe-Context), like the compartment resolution GETs.
+	path := "/v2/workspaces/undocumented/testmode/" + url.PathEscape(sandboxWorkspace) + "/close"
+	resp, err := client.PerformRequest(cmd.Context(), http.MethodPost, path, "", authConfigure)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	respBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return fmt.Errorf("delete sandbox failed: %s\n%s", resp.Status, string(respBytes))
+	}
+
+	out := cmd.OutOrStdout()
+	if sandboxName != "" {
+		fmt.Fprintf(out, "Deleted sandbox %q (%s)\n", sandboxName, stripeAccount)
+	} else {
+		fmt.Fprintf(out, "Deleted sandbox %s\n", stripeAccount)
+	}
+	return nil
+}
+
+// fetchSandboxesForParent lists the sandboxes under one live parent workspace via
+// GET /v2/compartments/user_accessible_sandboxes, flattening standalone and org-nested
+// sandbox entries.
+func fetchSandboxesForParent(ctx context.Context, client *stripe.Client, configure func(*http.Request) error, liveWorkspace string) ([]accessibleWorkspace, error) {
+	query := "live_compartment_parent_id=" + url.QueryEscape(liveWorkspace)
+	resp, err := client.PerformRequest(ctx, http.MethodGet, "/v2/compartments/user_accessible_sandboxes", query, configure)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	respBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return nil, fmt.Errorf("could not list sandboxes: %s\n%s", resp.Status, string(respBytes))
+	}
+	var parsed struct {
+		Workspaces    []accessibleWorkspace `json:"workspaces"`
+		Organizations []struct {
+			Workspaces []accessibleWorkspace `json:"workspaces"`
+		} `json:"organizations"`
+	}
+	if err := json.Unmarshal(respBytes, &parsed); err != nil {
+		return nil, fmt.Errorf("could not parse sandboxes response: %w", err)
+	}
+	out := append([]accessibleWorkspace{}, parsed.Workspaces...)
+	for _, org := range parsed.Organizations {
+		out = append(out, org.Workspaces...)
+	}
+	return out, nil
+}
+
+// resolveSandboxWorkspaceByAccount finds the sandbox workspace (wksp_test) whose account
+// (merchant_id) matches sandboxAccount. Sandboxes are listed per live parent, so it
+// searches each accessible live workspace's sandboxes. Returns the sandbox workspace id
+// and its name.
+func resolveSandboxWorkspaceByAccount(ctx context.Context, client *stripe.Client, configure func(*http.Request) error, sandboxAccount string) (string, string, error) {
+	liveWorkspaces, err := fetchAccessibleWorkspaces(ctx, client, configure)
+	if err != nil {
+		return "", "", err
+	}
+	for _, lw := range liveWorkspaces {
+		if !strings.HasPrefix(lw.ID, "wksp_") {
+			continue
+		}
+		sandboxes, err := fetchSandboxesForParent(ctx, client, configure, lw.ID)
+		if err != nil {
+			return "", "", err
+		}
+		for _, s := range sandboxes {
+			if s.MerchantID == sandboxAccount && strings.HasPrefix(s.ID, "wksp_test") {
+				return s.ID, s.Name, nil
+			}
+		}
+	}
+	return "", "", fmt.Errorf("no sandbox found for %s under your accessible live accounts; run `stripe sandbox list` to see available sandboxes", sandboxAccount)
+}
+
 func isSSHSession() bool {
 	return os.Getenv("SSH_TTY") != "" || os.Getenv("SSH_CONNECTION") != "" || os.Getenv("SSH_CLIENT") != ""
 }
diff --git a/pkg/cmd/sandbox_test.go b/pkg/cmd/sandbox_test.go
index 2577f9e1..d03174bf 100644
--- a/pkg/cmd/sandbox_test.go
+++ b/pkg/cmd/sandbox_test.go
@@ -1384,3 +1384,200 @@ func TestSandboxListCmd_NoUAT(t *testing.T) {
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "stripe login")
 }
+
+func TestSandboxDeleteCmd_Success(t *testing.T) {
+	cleanup := setupSandboxTestConfig(t)
+	defer cleanup()
+
+	err := config.KeyRing.Set(config.UATKeychainItemKey, []byte("keyinfo_live_faketoken"), "test uat")
+	require.NoError(t, err)
+
+	// The sandbox to delete is identified by its acct_. The command resolves that
+	// acct_ to its testmode workspace (wksp_) via the live parent's sandbox list,
+	// then POSTs the close. Server serves user_accessible, user_accessible_sandboxes,
+	// and the close.
+	var closedPath string
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		switch {
+		case r.Method == http.MethodGet && r.URL.Path == "/v2/compartments/user_accessible":
+			assert.Equal(t, "STRIPE-V2-SIG keyinfo_live_faketoken", r.Header.Get("Authorization"))
+			json.NewEncoder(w).Encode(map[string]interface{}{
+				"standalone_workspaces": []map[string]interface{}{
+					{"id": "wksp_live", "name": "Live", "merchant_id": "acct_live"},
+				},
+			})
+		case r.Method == http.MethodGet && r.URL.Path == "/v2/compartments/user_accessible_sandboxes":
+			if r.URL.RawQuery != "live_compartment_parent_id=wksp_live" {
+				t.Errorf("expected live_compartment_parent_id=wksp_live, got %s", r.URL.RawQuery)
+				w.WriteHeader(http.StatusBadRequest)
+				return
+			}
+			json.NewEncoder(w).Encode(map[string]interface{}{
+				"workspaces": []map[string]interface{}{
+					{"id": "wksp_test_a", "name": "sbxA", "merchant_id": "acct_a", "replica_of": "wksp_live"},
+					{"id": "wksp_test_b", "name": "sbxB", "merchant_id": "acct_b", "replica_of": "wksp_live"},
+				},
+			})
+		case r.Method == http.MethodPost && r.URL.Path == "/v2/workspaces/undocumented/testmode/wksp_test_a/close":
+			assert.Equal(t, "STRIPE-V2-SIG keyinfo_live_faketoken", r.Header.Get("Authorization"))
+			closedPath = r.URL.Path
+			json.NewEncoder(w).Encode(map[string]interface{}{"id": "wksp_test_a"})
+		default:
+			t.Errorf("unexpected request %s %s", r.Method, r.URL.Path)
+			w.WriteHeader(http.StatusNotFound)
+		}
+	}))
+	defer server.Close()
+
+	output, err := executeCommand(
+		rootCmd,
+		"sandbox", "delete",
+		"--api-base="+server.URL,
+		"--stripe-account=acct_a",
+	)
+
+	require.NoError(t, err)
+	// Only the targeted sandbox's testmode workspace was closed.
+	assert.Equal(t, "/v2/workspaces/undocumented/testmode/wksp_test_a/close", closedPath)
+	assert.Contains(t, output, "Deleted")
+	assert.Contains(t, output, "acct_a")
+	assert.Contains(t, output, "sbxA")
+}
+
+func TestSandboxDeleteCmd_IgnoresNonTestWorkspace(t *testing.T) {
+	cleanup := setupSandboxTestConfig(t)
+	defer cleanup()
+
+	err := config.KeyRing.Set(config.UATKeychainItemKey, []byte("keyinfo_live_faketoken"), "test uat")
+	require.NoError(t, err)
+
+	var closeRequested bool
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		switch {
+		case r.Method == http.MethodGet && r.URL.Path == "/v2/compartments/user_accessible":
+			json.NewEncoder(w).Encode(map[string]interface{}{
+				"standalone_workspaces": []map[string]interface{}{
+					{"id": "wksp_live", "name": "Live", "merchant_id": "acct_live"},
+				},
+			})
+		case r.Method == http.MethodGet && r.URL.Path == "/v2/compartments/user_accessible_sandboxes":
+			json.NewEncoder(w).Encode(map[string]interface{}{
+				"workspaces": []map[string]interface{}{
+					{"id": "wksp_live_child", "name": "notTestmode", "merchant_id": "acct_a", "replica_of": "wksp_live"},
+				},
+			})
+		case r.Method == http.MethodPost:
+			closeRequested = true
+			w.WriteHeader(http.StatusOK)
+		default:
+			t.Errorf("unexpected request %s %s", r.Method, r.URL.Path)
+			w.WriteHeader(http.StatusNotFound)
+		}
+	}))
+	defer server.Close()
+
+	_, err = executeCommand(
+		rootCmd,
+		"sandbox", "delete",
+		"--api-base="+server.URL,
+		"--stripe-account=acct_a",
+	)
+
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "no sandbox found")
+	assert.False(t, closeRequested)
+}
+
+func TestSandboxDeleteCmd_NotFound(t *testing.T) {
+	cleanup := setupSandboxTestConfig(t)
+	defer cleanup()
+
+	err := config.KeyRing.Set(config.UATKeychainItemKey, []byte("keyinfo_live_faketoken"), "test uat")
+	require.NoError(t, err)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		switch {
+		case r.Method == http.MethodGet && r.URL.Path == "/v2/compartments/user_accessible":
+			json.NewEncoder(w).Encode(map[string]interface{}{
+				"standalone_workspaces": []map[string]interface{}{
+					{"id": "wksp_live", "name": "Live", "merchant_id": "acct_live"},
+				},
+			})
+		case r.Method == http.MethodGet && r.URL.Path == "/v2/compartments/user_accessible_sandboxes":
+			json.NewEncoder(w).Encode(map[string]interface{}{
+				"workspaces": []map[string]interface{}{
+					{"id": "wksp_test_other", "name": "sbxOther", "merchant_id": "acct_other", "replica_of": "wksp_live"},
+				},
+			})
+		default:
+			t.Errorf("unexpected request %s %s", r.Method, r.URL.Path)
+			w.WriteHeader(http.StatusNotFound)
+		}
+	}))
+	defer server.Close()
+
+	_, err = executeCommand(
+		rootCmd,
+		"sandbox", "delete",
+		"--api-base="+server.URL,
+		"--stripe-account=acct_missing",
+	)
+
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "no sandbox found")
+}
+
+func TestSandboxDeleteCmd_RejectsOrg(t *testing.T) {
+	cleanup := setupSandboxTestConfig(t)
+	defer cleanup()
+
+	err := config.KeyRing.Set(config.UATKeychainItemKey, []byte("keyinfo_live_faketoken"), "test uat")
+	require.NoError(t, err)
+
+	// Rejected client-side before any network call.
+	_, err = executeCommand(
+		rootCmd,
+		"sandbox", "delete",
+		"--stripe-account=org_123",
+	)
+
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "not an organization")
+}
+
+func TestSandboxDeleteCmd_RequiresAccount(t *testing.T) {
+	cleanup := setupSandboxTestConfig(t)
+	defer cleanup()
+
+	err := config.KeyRing.Set(config.UATKeychainItemKey, []byte("keyinfo_live_faketoken"), "test uat")
+	require.NoError(t, err)
+
+	// Explicit empty value (Changed=true satisfies cobra's required-flag check, so the
+	// command's own emptiness guard is what fires here).
+	_, err = executeCommand(
+		rootCmd,
+		"sandbox", "delete",
+		"--stripe-account=",
+	)
+
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "required")
+}
+
+func TestSandboxDeleteCmd_NoUAT(t *testing.T) {
+	cleanup := setupSandboxTestConfig(t)
+	defer cleanup()
+
+	// No UAT seeded — keyring is empty.
+	_, err := executeCommand(
+		rootCmd,
+		"sandbox", "delete",
+		"--stripe-account=acct_a",
+	)
+
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "stripe login")
+}