diff --git a/apps/web/src/app/(authenticated)/settings/workspaces/page.test.tsx b/apps/web/src/app/(authenticated)/settings/workspaces/page.test.tsx
index f968643..c8310f1 100644
--- a/apps/web/src/app/(authenticated)/settings/workspaces/page.test.tsx
+++ b/apps/web/src/app/(authenticated)/settings/workspaces/page.test.tsx
@@ -1,60 +1,135 @@
-/**
- * Workspaces Page Tests
- * Tests for page structure and component integration
- */
+import type { UserWorkspace } from "@/lib/api/workspaces";
+import type { ReactElement, ReactNode } from "react";
 
-import { describe, it, expect, vi } from "vitest";
-import { render, screen } from "@testing-library/react";
+import { WorkspaceMemberRole } from "@mosaic/shared";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { createWorkspace, fetchUserWorkspaces } from "@/lib/api/workspaces";
+
+import WorkspacesPage from "./page";
 
-// Mock next/link
 vi.mock("next/link", () => ({
-  default: ({ children, href }: { children: React.ReactNode; href: string }): React.JSX.Element => (
-    <a href={href}>{children}</a>
-  ),
+  default: function LinkMock({
+    children,
+    href,
+  }: {
+    children: ReactNode;
+    href: string;
+  }): ReactElement {
+    return <a href={href}>{children}</a>;
+  },
 }));
 
-// Mock the WorkspaceCard component
 vi.mock("@/components/workspace/WorkspaceCard", () => ({
-  WorkspaceCard: (): React.JSX.Element => <div data-testid="workspace-card">WorkspaceCard</div>,
+  WorkspaceCard: function WorkspaceCardMock({
+    workspace,
+    userRole,
+    memberCount,
+  }: {
+    workspace: { name: string };
+    userRole: WorkspaceMemberRole;
+    memberCount: number;
+  }): ReactElement {
+    return (
+      <div data-testid="workspace-card">
+        {workspace.name} | {userRole} | {String(memberCount)}
+      </div>
+    );
+  },
 }));
 
-describe("WorkspacesPage", (): void => {
-  // Note: NODE_ENV is "test" during test runs, which triggers the Coming Soon view
-  // This tests the production-like behavior where mock data is hidden
+vi.mock("@/lib/api/workspaces", () => ({
+  fetchUserWorkspaces: vi.fn(),
+  createWorkspace: vi.fn(),
+}));
 
-  it("should render the Coming Soon view in non-development environments", async (): Promise<void> => {
-    const { default: WorkspacesPage } = await import("./page");
-    render(<WorkspacesPage />);
+const fetchUserWorkspacesMock = vi.mocked(fetchUserWorkspaces);
+const createWorkspaceMock = vi.mocked(createWorkspace);
 
-    // In test mode (non-development), should show Coming Soon
-    expect(screen.getByText("Coming Soon")).toBeInTheDocument();
-    expect(screen.getByText("Workspace Management")).toBeInTheDocument();
+const baseWorkspace: UserWorkspace = {
+  id: "workspace-1",
+  name: "Personal Workspace",
+  ownerId: "owner-1",
+  role: WorkspaceMemberRole.OWNER,
+  createdAt: "2026-01-01T00:00:00.000Z",
+};
+
+describe("WorkspacesPage", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
   });
 
-  it("should display appropriate description for workspace feature", async (): Promise<void> => {
-    const { default: WorkspacesPage } = await import("./page");
+  it("loads and renders user workspaces from the API", async () => {
+    fetchUserWorkspacesMock.mockResolvedValue([baseWorkspace]);
+
     render(<WorkspacesPage />);
 
-    expect(
-      screen.getByText(/create and manage workspaces to organize your projects/i)
-    ).toBeInTheDocument();
+    expect(screen.getByText("Loading workspaces...")).toBeInTheDocument();
+
+    expect(await screen.findByText("Your Workspaces (1)")).toBeInTheDocument();
+    expect(screen.getByTestId("workspace-card")).toHaveTextContent("Personal Workspace");
+    expect(fetchUserWorkspacesMock).toHaveBeenCalledTimes(1);
   });
 
-  it("should not render mock workspace data in Coming Soon view", async (): Promise<void> => {
-    const { default: WorkspacesPage } = await import("./page");
+  it("shows fetch errors in the UI", async () => {
+    fetchUserWorkspacesMock.mockRejectedValue(new Error("Unable to load workspaces"));
+
     render(<WorkspacesPage />);
 
-    // Should not show workspace cards or create form in non-development mode
-    expect(screen.queryByTestId("workspace-card")).not.toBeInTheDocument();
-    expect(screen.queryByText("Create New Workspace")).not.toBeInTheDocument();
+    expect(await screen.findByText("Unable to load workspaces")).toBeInTheDocument();
   });
 
-  it("should include link back to settings", async (): Promise<void> => {
-    const { default: WorkspacesPage } = await import("./page");
+  it("creates a workspace and refreshes the list", async () => {
+    fetchUserWorkspacesMock.mockResolvedValueOnce([baseWorkspace]).mockResolvedValueOnce([
+      baseWorkspace,
+      {
+        ...baseWorkspace,
+        id: "workspace-2",
+        name: "New Workspace",
+        role: WorkspaceMemberRole.MEMBER,
+      },
+    ]);
+    createWorkspaceMock.mockResolvedValue({
+      id: "workspace-2",
+      name: "New Workspace",
+      ownerId: "owner-1",
+      settings: {},
+      createdAt: "2026-01-02T00:00:00.000Z",
+      updatedAt: "2026-01-02T00:00:00.000Z",
+      memberCount: 1,
+    });
+
+    const user = userEvent.setup();
     render(<WorkspacesPage />);
 
-    const link = screen.getByRole("link", { name: /back to settings/i });
-    expect(link).toBeInTheDocument();
-    expect(link).toHaveAttribute("href", "/settings");
+    expect(await screen.findByText("Your Workspaces (1)")).toBeInTheDocument();
+
+    await user.type(screen.getByPlaceholderText("Enter workspace name..."), "New Workspace");
+    await user.click(screen.getByRole("button", { name: "Create Workspace" }));
+
+    await waitFor(() => {
+      expect(createWorkspaceMock).toHaveBeenCalledWith({ name: "New Workspace" });
+    });
+    await waitFor(() => {
+      expect(fetchUserWorkspacesMock).toHaveBeenCalledTimes(2);
+    });
+
+    expect(await screen.findByText("Your Workspaces (2)")).toBeInTheDocument();
+  });
+
+  it("shows create errors in the UI", async () => {
+    fetchUserWorkspacesMock.mockResolvedValue([baseWorkspace]);
+    createWorkspaceMock.mockRejectedValue(new Error("Workspace creation failed"));
+
+    const user = userEvent.setup();
+    render(<WorkspacesPage />);
+
+    expect(await screen.findByText("Your Workspaces (1)")).toBeInTheDocument();
+
+    await user.type(screen.getByPlaceholderText("Enter workspace name..."), "Bad Workspace");
+    await user.click(screen.getByRole("button", { name: "Create Workspace" }));
+
+    expect(await screen.findByText("Workspace creation failed")).toBeInTheDocument();
   });
 });
diff --git a/apps/web/src/app/(authenticated)/settings/workspaces/page.tsx b/apps/web/src/app/(authenticated)/settings/workspaces/page.tsx
index e4bf5f5..d50761e 100644
--- a/apps/web/src/app/(authenticated)/settings/workspaces/page.tsx
+++ b/apps/web/src/app/(authenticated)/settings/workspaces/page.tsx
@@ -1,72 +1,74 @@
 "use client";
 
-import type { ReactElement } from "react";
+import type { ReactElement, SyntheticEvent } from "react";
 
-import { useState } from "react";
+import { useCallback, useEffect, useState } from "react";
 import { WorkspaceCard } from "@/components/workspace/WorkspaceCard";
-import { ComingSoon } from "@/components/ui/ComingSoon";
-import { WorkspaceMemberRole } from "@mosaic/shared";
+import { createWorkspace, fetchUserWorkspaces, type UserWorkspace } from "@/lib/api/workspaces";
 import Link from "next/link";
 
-// Check if we're in development mode
-const isDevelopment = process.env.NODE_ENV === "development";
+function getErrorMessage(error: unknown, fallback: string): string {
+  if (error instanceof Error) {
+    return error.message;
+  }
 
-// Mock data - TODO: Replace with real API calls (development only)
-const mockWorkspaces = [
-  {
-    id: "ws-1",
-    name: "Personal Workspace",
-    ownerId: "user-1",
-    settings: {},
-    createdAt: new Date("2024-01-15"),
-    updatedAt: new Date("2024-01-15"),
-  },
-  {
-    id: "ws-2",
-    name: "Team Alpha",
-    ownerId: "user-2",
-    settings: {},
-    createdAt: new Date("2024-01-20"),
-    updatedAt: new Date("2024-01-20"),
-  },
-];
-
-const mockMemberships = [
-  { workspaceId: "ws-1", role: WorkspaceMemberRole.OWNER, memberCount: 1 },
-  { workspaceId: "ws-2", role: WorkspaceMemberRole.MEMBER, memberCount: 5 },
-];
+  return fallback;
+}
 
 /**
- * Workspaces Page Content - Development Only
- * Shows mock workspace data for development purposes
+ * Workspaces Page
+ * Fetches and creates workspaces through the real API.
  */
-function WorkspacesPageContent(): ReactElement {
+export default function WorkspacesPage(): ReactElement {
+  const [workspaces, setWorkspaces] = useState<UserWorkspace[]>([]);
+  const [isLoading, setIsLoading] = useState(true);
+  const [loadError, setLoadError] = useState<string | null>(null);
   const [isCreating, setIsCreating] = useState(false);
   const [newWorkspaceName, setNewWorkspaceName] = useState("");
+  const [createError, setCreateError] = useState<string | null>(null);
 
-  // TODO: Replace with real API call
-  const workspacesWithRoles = mockWorkspaces.map((workspace) => {
-    const membership = mockMemberships.find((m) => m.workspaceId === workspace.id);
-    return {
-      ...workspace,
-      userRole: membership?.role ?? WorkspaceMemberRole.GUEST,
-      memberCount: membership?.memberCount ?? 0,
-    };
-  });
+  const loadWorkspaces = useCallback(async (): Promise<void> => {
+    setIsLoading(true);
 
-  const handleCreateWorkspace = async (e: React.SyntheticEvent<HTMLFormElement>): Promise<void> => {
+    try {
+      const data = await fetchUserWorkspaces();
+      setWorkspaces(data);
+      setLoadError(null);
+    } catch (error) {
+      setLoadError(getErrorMessage(error, "Failed to load workspaces"));
+    } finally {
+      setIsLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    void loadWorkspaces();
+  }, [loadWorkspaces]);
+
+  const workspacesWithRoles = workspaces.map((workspace) => ({
+    ...workspace,
+    settings: {},
+    createdAt: new Date(workspace.createdAt),
+    updatedAt: new Date(workspace.createdAt),
+    userRole: workspace.role,
+    memberCount: 1,
+  }));
+
+  const handleCreateWorkspace = async (e: SyntheticEvent<HTMLFormElement>): Promise<void> => {
     e.preventDefault();
-    if (!newWorkspaceName.trim()) return;
+
+    const workspaceName = newWorkspaceName.trim();
+    if (!workspaceName) return;
 
     setIsCreating(true);
+    setCreateError(null);
+
     try {
-      // TODO: Replace with real API call
-      await new Promise((resolve) => setTimeout(resolve, 1000)); // Simulate API call
-      alert(`Workspace "${newWorkspaceName}" created successfully!`);
+      await createWorkspace({ name: workspaceName });
       setNewWorkspaceName("");
-    } catch (_error) {
-      console.error("Failed to create workspace:", _error);
-      alert("Failed to create workspace");
+      await loadWorkspaces();
+    } catch (error) {
+      setCreateError(getErrorMessage(error, "Failed to create workspace"));
     } finally {
       setIsCreating(false);
     }
@@ -106,14 +108,27 @@ function WorkspacesPageContent(): ReactElement {
             {isCreating ? "Creating..." : "Create Workspace"}
           </button>
         </form>
+        {createError !== null && (
+          <div className="mt-3 rounded-md border border-red-200 bg-red-50 px-3 py-2 text-sm text-red-700">
+            {createError}
+          </div>
+        )}
       </div>
 
       {/* Workspace List */}
       <div className="space-y-4">
         <h2 className="text-xl font-semibold text-gray-900">
-          Your Workspaces ({workspacesWithRoles.length})
+          Your Workspaces ({isLoading ? "..." : workspacesWithRoles.length})
         </h2>
-        {workspacesWithRoles.length === 0 ? (
+        {loadError !== null ? (
+          <div className="rounded-md border border-red-200 bg-red-50 px-4 py-3 text-red-700">
+            {loadError}
+          </div>
+        ) : isLoading ? (
+          <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-12 text-center text-gray-600">
+            Loading workspaces...
+          </div>
+        ) : workspacesWithRoles.length === 0 ? (
           <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-12 text-center">
             <svg
               className="mx-auto h-12 w-12 text-gray-400 mb-4"
@@ -147,26 +162,3 @@ function WorkspacesPageContent(): ReactElement {
     </main>
   );
 }
-
-/**
- * Workspaces Page Entry Point
- * Shows development content or Coming Soon based on environment
- */
-export default function WorkspacesPage(): ReactElement {
-  // In production, show Coming Soon placeholder
-  if (!isDevelopment) {
-    return (
-      <ComingSoon
-        feature="Workspace Management"
-        description="Create and manage workspaces to organize your projects and collaborate with your team. This feature is currently under development."
-      >
-        <Link href="/settings" className="text-sm text-blue-600 hover:text-blue-700">
-          Back to Settings
-        </Link>
-      </ComingSoon>
-    );
-  }
-
-  // In development, show the full page with mock data
-  return <WorkspacesPageContent />;
-}
diff --git a/apps/web/src/lib/api/workspaces.ts b/apps/web/src/lib/api/workspaces.ts
index fe38a61..02fcd33 100644
--- a/apps/web/src/lib/api/workspaces.ts
+++ b/apps/web/src/lib/api/workspaces.ts
@@ -3,7 +3,8 @@
  * User-scoped workspace discovery — does NOT require X-Workspace-Id header.
  */
 
-import { apiGet } from "./client";
+import type { WorkspaceMemberRole } from "@mosaic/shared";
+import { apiGet, apiPost } from "./client";
 
 /**
  * A workspace entry from the user's membership list.
@@ -13,10 +14,24 @@ export interface UserWorkspace {
   id: string;
   name: string;
   ownerId: string;
-  role: string;
+  role: WorkspaceMemberRole;
   createdAt: string;
 }
 
+export interface CreateWorkspaceDto {
+  name: string;
+}
+
+export interface CreatedWorkspace {
+  id: string;
+  name: string;
+  ownerId: string;
+  settings: Record<string, unknown>;
+  createdAt: string;
+  updatedAt: string;
+  memberCount: number;
+}
+
 /**
  * Fetch all workspaces the authenticated user is a member of.
  * The API auto-provisions a default workspace if the user has none.
@@ -24,3 +39,10 @@ export interface UserWorkspace {
 export async function fetchUserWorkspaces(): Promise<UserWorkspace[]> {
   return apiGet<UserWorkspace[]>("/api/workspaces");
 }
+
+/**
+ * Create a workspace through the admin endpoint.
+ */
+export async function createWorkspace(dto: CreateWorkspaceDto): Promise<CreatedWorkspace> {
+  return apiPost<CreatedWorkspace>("/api/admin/workspaces", dto);
+}
diff --git a/apps/web/src/lib/auth/auth-context.test.tsx b/apps/web/src/lib/auth/auth-context.test.tsx
index fd15c70..7783e6e 100644
--- a/apps/web/src/lib/auth/auth-context.test.tsx
+++ b/apps/web/src/lib/auth/auth-context.test.tsx
@@ -3,6 +3,7 @@ import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import { render, screen, waitFor } from "@testing-library/react";
 import { AuthProvider, useAuth } from "./auth-context";
 import type { AuthUser } from "@mosaic/shared";
+import { WorkspaceMemberRole } from "@mosaic/shared";
 
 // Mock the API client
 vi.mock("../api/client", () => ({
@@ -761,7 +762,7 @@ describe("AuthContext", (): void => {
           id: "ws-1",
           name: "My Workspace",
           ownerId: "user-1",
-          role: "OWNER",
+          role: WorkspaceMemberRole.OWNER,
           createdAt: "2026-01-01",
         },
       ]);
@@ -795,14 +796,14 @@ describe("AuthContext", (): void => {
           id: "ws-abc-123",
           name: "My Workspace",
           ownerId: "user-1",
-          role: "OWNER",
+          role: WorkspaceMemberRole.OWNER,
           createdAt: "2026-01-01",
         },
         {
           id: "ws-def-456",
           name: "Second Workspace",
           ownerId: "other",
-          role: "MEMBER",
+          role: WorkspaceMemberRole.MEMBER,
           createdAt: "2026-02-01",
         },
       ]);
@@ -892,7 +893,7 @@ describe("AuthContext", (): void => {
           id: "ws-1",
           name: "My Workspace",
           ownerId: "user-1",
-          role: "OWNER",
+          role: WorkspaceMemberRole.OWNER,
           createdAt: "2026-01-01",
         },
       ]);