diff --git a/app/routes/admin_pages.py b/app/routes/admin_pages.py
index b03d5dda..4bfc1b3a 100644
--- a/app/routes/admin_pages.py
+++ b/app/routes/admin_pages.py
@@ -95,6 +95,32 @@ async def admin_login_page(
     return templates.TemplateResponse("admin/login.html", {"request": request})
 
 
+@router.get("/select-platform", response_class=HTMLResponse, include_in_schema=False)
+async def admin_select_platform_page(
+    request: Request,
+    current_user: User | None = Depends(get_current_admin_optional),
+):
+    """
+    Render platform selection page for platform admins.
+
+    Platform admins with access to multiple platforms must select
+    which platform they want to manage before accessing the dashboard.
+    Super admins are redirected to dashboard (they have global access).
+    """
+    if not current_user:
+        # Not logged in, redirect to login
+        return RedirectResponse(url="/admin/login", status_code=302)
+
+    if current_user.is_super_admin:
+        # Super admins don't need platform selection
+        return RedirectResponse(url="/admin/dashboard", status_code=302)
+
+    return templates.TemplateResponse(
+        "admin/select-platform.html",
+        {"request": request, "user": current_user},
+    )
+
+
 # ============================================================================
 # AUTHENTICATED ROUTES (Admin Only)
 # ============================================================================
diff --git a/app/templates/admin/partials/header.html b/app/templates/admin/partials/header.html
index 38a0e621..4236725c 100644
--- a/app/templates/admin/partials/header.html
+++ b/app/templates/admin/partials/header.html
@@ -20,6 +20,27 @@
         </div>
 
         <ul class="flex items-center flex-shrink-0 space-x-6">
+            <!-- Platform Context Indicator (for platform admins) -->
+            <li class="flex" x-data="platformContext()">
+                <template x-if="platform && !isSuperAdmin">
+                    <div class="flex items-center space-x-2">
+                        <span class="px-3 py-1 text-xs font-medium text-purple-700 bg-purple-100 dark:text-purple-300 dark:bg-purple-900/30 rounded-full">
+                            <span x-text="platform.name"></span>
+                        </span>
+                        <a href="/admin/select-platform"
+                           class="text-xs text-gray-500 hover:text-purple-600 dark:text-gray-400 dark:hover:text-purple-400"
+                           title="Switch platform">
+                            <span x-html="$icon('switch-horizontal', 'w-4 h-4')"></span>
+                        </a>
+                    </div>
+                </template>
+                <template x-if="isSuperAdmin">
+                    <span class="px-3 py-1 text-xs font-medium text-green-700 bg-green-100 dark:text-green-300 dark:bg-green-900/30 rounded-full">
+                        Super Admin
+                    </span>
+                </template>
+            </li>
+
             <!-- Theme toggler -->
             <li class="flex">
                 <button class="rounded-md focus:outline-none focus:shadow-outline-purple"
@@ -182,6 +203,53 @@
 
 <!-- Header notifications and logout handler script -->
 <script>
+// Platform context component for header
+function platformContext() {
+    return {
+        platform: null,
+        isSuperAdmin: false,
+
+        init() {
+            // Try to get platform from localStorage
+            const storedPlatform = localStorage.getItem('admin_platform');
+            if (storedPlatform) {
+                try {
+                    this.platform = JSON.parse(storedPlatform);
+                } catch (e) {
+                    console.warn('Failed to parse stored platform:', e);
+                }
+            }
+
+            // Check if user is super admin
+            const storedUser = localStorage.getItem('admin_user');
+            if (storedUser) {
+                try {
+                    const user = JSON.parse(storedUser);
+                    this.isSuperAdmin = user.is_super_admin === true;
+                } catch (e) {
+                    console.warn('Failed to parse stored user:', e);
+                }
+            }
+        }
+    };
+}
+
+// Header messages component
+function headerMessages() {
+    return {
+        unreadCount: 0,
+
+        async init() {
+            try {
+                const response = await apiClient.get('/admin/messages/unread-count');
+                this.unreadCount = response.count || 0;
+            } catch (error) {
+                // Silently fail - messages count is not critical
+            }
+        }
+    };
+}
+
 // Header notifications component
 function headerNotifications() {
     return {
@@ -288,6 +356,7 @@ document.addEventListener('alpine:init', () => {
                     // Keep admin_last_visited_page so user returns to same page after login
                     localStorage.removeItem('admin_token');
                     localStorage.removeItem('admin_user');
+                    localStorage.removeItem('admin_platform');
                     // Note: Do NOT use localStorage.clear() - it would clear vendor/customer tokens too
                     window.location.href = '/admin/login';
                 });
diff --git a/app/templates/admin/select-platform.html b/app/templates/admin/select-platform.html
new file mode 100644
index 00000000..215b61c6
--- /dev/null
+++ b/app/templates/admin/select-platform.html
@@ -0,0 +1,130 @@
+{# app/templates/admin/select-platform.html #}
+<!DOCTYPE html>
+<html :class="{ 'dark': dark }" x-data="selectPlatform()" lang="en">
+<head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Select Platform - Admin Panel</title>
+    <link href="/static/shared/fonts/inter.css" rel="stylesheet" />
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap" rel="stylesheet" />
+    <link rel="stylesheet" href="{{ url_for('static', path='admin/css/tailwind.output.css') }}" />
+    <style>[x-cloak] { display: none !important; }</style>
+</head>
+<body x-cloak>
+    <div class="flex items-center min-h-screen p-6 bg-gray-50 dark:bg-gray-900">
+        <div class="flex-1 h-full max-w-xl mx-auto overflow-hidden bg-white rounded-lg shadow-xl dark:bg-gray-800">
+            <div class="flex flex-col overflow-y-auto">
+                <div class="flex items-center justify-center p-6 sm:p-12">
+                    <div class="w-full">
+                        <!-- Header -->
+                        <div class="text-center mb-8">
+                            <h1 class="text-2xl font-semibold text-gray-700 dark:text-gray-200">
+                                Select Platform
+                            </h1>
+                            <p class="mt-2 text-gray-600 dark:text-gray-400">
+                                Choose a platform to manage
+                            </p>
+                        </div>
+
+                        <!-- Loading State -->
+                        <div x-show="loading" class="flex justify-center py-8">
+                            <svg class="animate-spin h-8 w-8 text-purple-600" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
+                                <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+                                <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
+                            </svg>
+                        </div>
+
+                        <!-- Error State -->
+                        <div x-show="error" x-cloak class="mb-4 p-4 bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 rounded-lg">
+                            <p class="text-red-700 dark:text-red-400" x-text="error"></p>
+                        </div>
+
+                        <!-- Super Admin Notice -->
+                        <div x-show="isSuperAdmin && !loading" x-cloak class="mb-6 p-4 bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800 rounded-lg">
+                            <p class="text-blue-700 dark:text-blue-400">
+                                You are a Super Admin with access to all platforms. Redirecting to dashboard...
+                            </p>
+                        </div>
+
+                        <!-- Platform List -->
+                        <div x-show="!loading && !isSuperAdmin && platforms.length > 0" x-cloak class="space-y-3">
+                            <template x-for="platform in platforms" :key="platform.id">
+                                <button
+                                    @click="selectPlatform(platform)"
+                                    :disabled="selecting"
+                                    class="w-full flex items-center p-4 bg-gray-50 dark:bg-gray-700 rounded-lg border-2 border-transparent hover:border-purple-500 hover:bg-purple-50 dark:hover:bg-purple-900/20 transition-all duration-200 focus:outline-none focus:ring-2 focus:ring-purple-500 disabled:opacity-50 disabled:cursor-not-allowed"
+                                >
+                                    <!-- Platform Icon/Logo -->
+                                    <div class="flex-shrink-0 w-12 h-12 rounded-lg bg-purple-100 dark:bg-purple-900/30 flex items-center justify-center mr-4">
+                                        <template x-if="platform.logo">
+                                            <img :src="platform.logo" :alt="platform.name" class="w-8 h-8 object-contain">
+                                        </template>
+                                        <template x-if="!platform.logo">
+                                            <span class="text-xl font-bold text-purple-600 dark:text-purple-400" x-text="platform.code.charAt(0).toUpperCase()"></span>
+                                        </template>
+                                    </div>
+
+                                    <!-- Platform Info -->
+                                    <div class="flex-1 text-left">
+                                        <h3 class="text-lg font-medium text-gray-800 dark:text-gray-200" x-text="platform.name"></h3>
+                                        <p class="text-sm text-gray-500 dark:text-gray-400" x-text="platform.code"></p>
+                                    </div>
+
+                                    <!-- Arrow -->
+                                    <div class="flex-shrink-0 ml-4">
+                                        <svg class="w-5 h-5 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"></path>
+                                        </svg>
+                                    </div>
+                                </button>
+                            </template>
+                        </div>
+
+                        <!-- No Platforms -->
+                        <div x-show="!loading && !isSuperAdmin && platforms.length === 0" x-cloak class="text-center py-8">
+                            <svg class="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z"></path>
+                            </svg>
+                            <h3 class="mt-2 text-sm font-medium text-gray-900 dark:text-gray-200">No platforms assigned</h3>
+                            <p class="mt-1 text-sm text-gray-500 dark:text-gray-400">Contact your administrator to get platform access.</p>
+                        </div>
+
+                        <!-- Logout Link -->
+                        <div class="mt-8 text-center">
+                            <button
+                                @click="logout()"
+                                class="text-sm text-gray-600 dark:text-gray-400 hover:text-purple-600 dark:hover:text-purple-400 underline"
+                            >
+                                Sign out and use a different account
+                            </button>
+                        </div>
+
+                        <!-- Theme Toggle -->
+                        <div class="mt-4 flex justify-center">
+                            <button
+                                @click="toggleDarkMode()"
+                                class="p-2 text-gray-500 rounded-full hover:bg-gray-100 dark:hover:bg-gray-700 focus:outline-none"
+                                aria-label="Toggle dark mode"
+                            >
+                                <svg x-show="!dark" class="w-5 h-5" fill="currentColor" viewBox="0 0 20 20">
+                                    <path d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z"></path>
+                                </svg>
+                                <svg x-show="dark" class="w-5 h-5" fill="currentColor" viewBox="0 0 20 20">
+                                    <path fill-rule="evenodd" d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z" clip-rule="evenodd"></path>
+                                </svg>
+                            </button>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <!-- Scripts -->
+    <script src="{{ url_for('static', path='shared/js/log-config.js') }}"></script>
+    <script src="{{ url_for('static', path='shared/js/utils.js') }}"></script>
+    <script src="{{ url_for('static', path='shared/js/api-client.js') }}"></script>
+    <script src="{{ url_for('static', path='admin/js/select-platform.js') }}"></script>
+    <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.13.3/dist/cdn.min.js"></script>
+</body>
+</html>
diff --git a/models/schema/auth.py b/models/schema/auth.py
index 8862e21b..8237608f 100644
--- a/models/schema/auth.py
+++ b/models/schema/auth.py
@@ -25,6 +25,7 @@ class UserResponse(BaseModel):
     username: str
     role: str
     is_active: bool
+    is_super_admin: bool = False
     preferred_language: str | None = None
     last_login: datetime | None = None
     created_at: datetime
diff --git a/static/admin/js/login.js b/static/admin/js/login.js
index cf3da16a..1590adbe 100644
--- a/static/admin/js/login.js
+++ b/static/admin/js/login.js
@@ -166,7 +166,8 @@ function adminLogin() {
                     loginLog.debug('User data stored:', {
                         username: response.user.username,
                         role: response.user.role,
-                        id: response.user.id
+                        id: response.user.id,
+                        is_super_admin: response.user.is_super_admin
                     });
                 }
 
@@ -180,12 +181,32 @@ function adminLogin() {
                 });
 
                 // Show success message
-                this.success = 'Login successful! Redirecting...';
+                this.success = 'Login successful! Checking platform access...';
                 loginLog.info('Success message displayed to user');
 
+                // Check if platform selection is required
+                try {
+                    loginLog.info('Checking accessible platforms...');
+                    const platformsResponse = await apiClient.get('/api/v1/admin/auth/accessible-platforms');
+                    loginLog.debug('Accessible platforms response:', platformsResponse);
+
+                    if (platformsResponse.requires_platform_selection) {
+                        // Platform admin needs to select a platform
+                        loginLog.info('Platform selection required, redirecting...');
+                        this.success = 'Login successful! Please select a platform...';
+                        window.location.href = '/admin/select-platform';
+                        return;
+                    }
+                } catch (platformError) {
+                    loginLog.warn('Could not check platforms, proceeding to dashboard:', platformError);
+                }
+
+                // Super admin or single platform - proceed to dashboard
+                this.success = 'Login successful! Redirecting...';
+
                 // Check for last visited page (saved before logout)
                 const lastPage = localStorage.getItem('admin_last_visited_page');
-                const redirectTo = (lastPage && lastPage.startsWith('/admin/') && !lastPage.includes('/login'))
+                const redirectTo = (lastPage && lastPage.startsWith('/admin/') && !lastPage.includes('/login') && !lastPage.includes('/select-platform'))
                     ? lastPage
                     : '/admin/dashboard';
 
diff --git a/static/admin/js/select-platform.js b/static/admin/js/select-platform.js
new file mode 100644
index 00000000..b29c63c2
--- /dev/null
+++ b/static/admin/js/select-platform.js
@@ -0,0 +1,156 @@
+// static/admin/js/select-platform.js
+// Platform selection page for platform admins
+
+const platformLog = window.LogConfig ? window.LogConfig.createLogger('PLATFORM_SELECT') : console;
+
+function selectPlatform() {
+    return {
+        dark: false,
+        loading: true,
+        selecting: false,
+        error: null,
+        platforms: [],
+        isSuperAdmin: false,
+
+        async init() {
+            platformLog.info('=== PLATFORM SELECTION PAGE INITIALIZING ===');
+
+            // Set theme
+            this.dark = localStorage.getItem('theme') === 'dark';
+
+            // Check if user is logged in
+            const token = localStorage.getItem('admin_token');
+            if (!token) {
+                platformLog.warn('No token found, redirecting to login');
+                window.location.href = '/admin/login';
+                return;
+            }
+
+            // Load accessible platforms
+            await this.loadPlatforms();
+        },
+
+        async loadPlatforms() {
+            this.loading = true;
+            this.error = null;
+
+            try {
+                platformLog.info('Fetching accessible platforms...');
+                const response = await apiClient.get('/api/v1/admin/auth/accessible-platforms');
+                platformLog.debug('Platforms response:', response);
+
+                this.isSuperAdmin = response.is_super_admin;
+                this.platforms = response.platforms || [];
+
+                if (this.isSuperAdmin) {
+                    platformLog.info('User is super admin, redirecting to dashboard...');
+                    setTimeout(() => {
+                        window.location.href = '/admin/dashboard';
+                    }, 1500);
+                    return;
+                }
+
+                if (!response.requires_platform_selection && this.platforms.length === 1) {
+                    // Only one platform assigned, auto-select it
+                    platformLog.info('Single platform assigned, auto-selecting...');
+                    await this.selectPlatform(this.platforms[0]);
+                    return;
+                }
+
+                platformLog.info(`Loaded ${this.platforms.length} platforms`);
+
+            } catch (error) {
+                platformLog.error('Failed to load platforms:', error);
+
+                if (error.message && error.message.includes('401')) {
+                    // Token expired or invalid
+                    window.location.href = '/admin/login';
+                    return;
+                }
+
+                this.error = error.message || 'Failed to load platforms. Please try again.';
+            } finally {
+                this.loading = false;
+            }
+        },
+
+        async selectPlatform(platform) {
+            if (this.selecting) return;
+
+            this.selecting = true;
+            this.error = null;
+            platformLog.info(`Selecting platform: ${platform.code}`);
+
+            try {
+                const response = await apiClient.post(
+                    `/api/v1/admin/auth/select-platform?platform_id=${platform.id}`
+                );
+
+                platformLog.debug('Platform selection response:', response);
+
+                if (response.access_token) {
+                    // Store new token with platform context
+                    localStorage.setItem('admin_token', response.access_token);
+                    localStorage.setItem('token', response.access_token);
+
+                    // Store selected platform info
+                    localStorage.setItem('admin_platform', JSON.stringify({
+                        id: platform.id,
+                        code: platform.code,
+                        name: platform.name
+                    }));
+
+                    // Update user data if provided
+                    if (response.user) {
+                        localStorage.setItem('admin_user', JSON.stringify(response.user));
+                    }
+
+                    platformLog.info('Platform selected successfully, redirecting to dashboard...');
+
+                    // Redirect to dashboard or last visited page
+                    const lastPage = localStorage.getItem('admin_last_visited_page');
+                    const redirectTo = (lastPage && lastPage.startsWith('/admin/') && !lastPage.includes('/login') && !lastPage.includes('/select-platform'))
+                        ? lastPage
+                        : '/admin/dashboard';
+
+                    window.location.href = redirectTo;
+                } else {
+                    throw new Error('No token received from server');
+                }
+
+            } catch (error) {
+                platformLog.error('Platform selection failed:', error);
+                this.error = error.message || 'Failed to select platform. Please try again.';
+                this.selecting = false;
+            }
+        },
+
+        logout() {
+            platformLog.info('Logging out...');
+
+            fetch('/api/v1/admin/auth/logout', {
+                method: 'POST',
+                headers: {
+                    'Authorization': `Bearer ${localStorage.getItem('admin_token')}`
+                }
+            })
+            .catch((error) => {
+                platformLog.error('Logout API error:', error);
+            })
+            .finally(() => {
+                localStorage.removeItem('admin_token');
+                localStorage.removeItem('admin_user');
+                localStorage.removeItem('admin_platform');
+                localStorage.removeItem('token');
+                window.location.href = '/admin/login';
+            });
+        },
+
+        toggleDarkMode() {
+            this.dark = !this.dark;
+            localStorage.setItem('theme', this.dark ? 'dark' : 'light');
+        }
+    };
+}
+
+platformLog.info('Platform selection module loaded');