diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 363b765..a864750 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,14 +1,35 @@
 import { createBrowserRouter, RouterProvider } from 'react-router'
+import { setUnauthorizedHandler } from '@/apis'
+import { RequireAuth } from '@/features/auth'
 import LoginPage from '@/pages/LoginPage'
 import ListPage from '@/pages/ListPage'
 import ChatPage from '@/pages/ChatPage'
 
 const router = createBrowserRouter([
   { path: '/', element: <LoginPage /> },
-  { path: '/list', element: <ListPage /> },
-  { path: '/chat', element: <ChatPage /> },
+  {
+    path: '/list',
+    element: (
+      <RequireAuth>
+        <ListPage />
+      </RequireAuth>
+    ),
+  },
+  {
+    path: '/chat',
+    element: (
+      <RequireAuth>
+        <ChatPage />
+      </RequireAuth>
+    ),
+  },
 ])
 
+// 토큰 만료/폐기로 인증이 끊기면 로그인 페이지로 이동시킨다.
+setUnauthorizedHandler(() => {
+  void router.navigate('/')
+})
+
 function App() {
   return <RouterProvider router={router} />
 }
diff --git a/frontend/src/features/auth/components/RequireAuth.tsx b/frontend/src/features/auth/components/RequireAuth.tsx
new file mode 100644
index 0000000..fc4608c
--- /dev/null
+++ b/frontend/src/features/auth/components/RequireAuth.tsx
@@ -0,0 +1,12 @@
+import type { ReactNode } from 'react'
+import { Navigate } from 'react-router'
+import { tokenStorage } from '@/apis'
+
+// 토큰이 없으면 로그인 페이지로 보낸다 (인증 영역 가드).
+// 토큰이 있으나 만료/폐기된 경우는 요청 시 인터셉터가 세션을 종료시킨다.
+export function RequireAuth({ children }: { children: ReactNode }) {
+  if (!tokenStorage.hasToken()) {
+    return <Navigate to="/" replace />
+  }
+  return <>{children}</>
+}
diff --git a/frontend/src/features/auth/components/SidebarFooter.tsx b/frontend/src/features/auth/components/SidebarFooter.tsx
index aeca1d5..eda61dc 100644
--- a/frontend/src/features/auth/components/SidebarFooter.tsx
+++ b/frontend/src/features/auth/components/SidebarFooter.tsx
@@ -1,18 +1,30 @@
+import { useNavigate } from 'react-router'
+import { useLogoutMutation, useMeQuery } from '@/apis'
 import { Button } from '@/components'
 
 // 사이드바 하단: 공급사명 + 로그아웃
 export function SidebarFooter() {
+  const navigate = useNavigate()
+  const { data: user } = useMeQuery()
+  const logout = useLogoutMutation()
+
+  const handleLogout = () => {
+    logout.mutate(undefined, {
+      onSuccess: () => navigate('/'),
+    })
+  }
+
   return (
     <div className="flex w-full h-[60px] py-3 px-8 gap-3 items-center">
       <div className="flex-1 flex items-center min-w-0 text-sm text-foreground">
-        {/* TODO: 공급사명 (auth store 연동) */}
-        <span className="truncate">-</span>
+        <span className="truncate">{user?.supplierName ?? '-'}</span>
       </div>
       <Button
         variant="secondary"
         size="sm"
         className="w-[61px] px-2 rounded-[4px] text-xs flex-shrink-0"
-        // TODO: 로그아웃 mutation 연동
+        onClick={handleLogout}
+        disabled={logout.isPending}
       >
         로그아웃
       </Button>
diff --git a/frontend/src/features/auth/hooks/useLoginMutation.ts b/frontend/src/features/auth/hooks/useLoginMutation.ts
index 3295d41..76fbeee 100644
--- a/frontend/src/features/auth/hooks/useLoginMutation.ts
+++ b/frontend/src/features/auth/hooks/useLoginMutation.ts
@@ -1,13 +1,2 @@
-import { useMutation } from '@tanstack/react-query'
-
-export interface LoginParams {
-  id: string
-  password: string
-}
-
-// 임시 stub (검증만 통과하면 성공). TODO: 로그인 API 연동
-export function useLoginMutation() {
-  return useMutation<void, Error, LoginParams>({
-    mutationFn: async () => {},
-  })
-}
+// 실제 로그인 API 연동은 apis/auth 로 이전됨. 기존 import 경로 호환을 위해 재노출한다.
+export { useLoginMutation, type LoginParams } from '@/apis/auth'
diff --git a/frontend/src/features/auth/index.ts b/frontend/src/features/auth/index.ts
index 2b91506..e940c43 100644
--- a/frontend/src/features/auth/index.ts
+++ b/frontend/src/features/auth/index.ts
@@ -1,2 +1,3 @@
 export { LoginForm } from '@/features/auth/components/LoginForm'
 export { SidebarFooter } from '@/features/auth/components/SidebarFooter'
+export { RequireAuth } from '@/features/auth/components/RequireAuth'
diff --git a/frontend/src/pages/LoginPage.tsx b/frontend/src/pages/LoginPage.tsx
index 8543179..dc36dbb 100644
--- a/frontend/src/pages/LoginPage.tsx
+++ b/frontend/src/pages/LoginPage.tsx
@@ -1,7 +1,14 @@
+import { Navigate } from 'react-router'
+import { tokenStorage } from '@/apis'
 import { Logo } from '@/components'
 import { LoginForm } from '@/features/auth'
 
 export function LoginPage() {
+  // 이미 로그인된 상태면 목록으로
+  if (tokenStorage.hasToken()) {
+    return <Navigate to="/list" replace />
+  }
+
   return (
     <main className="flex min-h-svh w-full items-center justify-center px-6">
       <div className="flex w-full max-w-100 flex-col items-center gap-10">