diff --git a/src/hooks/auth/useAuth.ts b/src/hooks/auth/useAuth.ts
index 10204a99..f2effb8d 100644
--- a/src/hooks/auth/useAuth.ts
+++ b/src/hooks/auth/useAuth.ts
@@ -1,3 +1,5 @@
+import { useQueryClient } from "@tanstack/react-query";
+
 import { useCoreMutation } from "@/hooks/customQuery";
 
 import {
@@ -11,15 +13,20 @@ import {
   verifySMS,
 } from "@/api/auth/auth";
 import useAuthStore from "@/store/useAuthStore";
+import useWorkspaceStore from "@/store/useWorkspaceStore";
 
 export const useAuth = () => {
   const { login: loginAction } = useAuthStore();
+  const queryClient = useQueryClient();
 
   const useLogin = useCoreMutation(login, {
     userOnSuccess: (response, vars) => {
+      queryClient.clear();
+      useWorkspaceStore.getState().reset();
       loginAction(vars.email, response.data.accessToken);
     },
   });
+
   const useSignUp = useCoreMutation(signUp);
   const useSendCode = useCoreMutation(sendEmail);
   const useCheckCode = useCoreMutation(verifyEmail);
diff --git a/src/hooks/auth/useDeleteMyAccount.ts b/src/hooks/auth/useDeleteMyAccount.ts
index 555a643c..75b5118d 100644
--- a/src/hooks/auth/useDeleteMyAccount.ts
+++ b/src/hooks/auth/useDeleteMyAccount.ts
@@ -1,4 +1,3 @@
-import { useNavigate } from "react-router-dom";
 import { useQueryClient } from "@tanstack/react-query";
 import { toast } from "sonner";
 
@@ -8,9 +7,9 @@ import { useCoreMutation } from "@/hooks/customQuery";
 
 import { deleteMyAccount } from "@/api/auth/auth";
 import useAuthStore from "@/store/useAuthStore";
+import useWorkspaceStore from "@/store/useWorkspaceStore";
 
 export function useDeleteMyAccount() {
-  const nav = useNavigate();
   const queryClient = useQueryClient();
   const logout = useAuthStore((s) => s.logout);
 
@@ -20,8 +19,9 @@ export function useDeleteMyAccount() {
         "회원 탈퇴가 완료되었습니다. 30일 후 계정이 완전히 삭제됩니다",
       );
       queryClient.clear();
+      useWorkspaceStore.getState().reset();
       logout();
-      nav("/", { replace: true });
+      window.location.replace("/");
     },
     userOnError: (error) => {
       const apiError = error as IApiErrorResponse;
diff --git a/src/hooks/auth/useLogout.ts b/src/hooks/auth/useLogout.ts
index aa58c752..6236b153 100644
--- a/src/hooks/auth/useLogout.ts
+++ b/src/hooks/auth/useLogout.ts
@@ -1,4 +1,3 @@
-import { useNavigate } from "react-router-dom";
 import { useQueryClient } from "@tanstack/react-query";
 import { toast } from "sonner";
 
@@ -8,9 +7,9 @@ import { useCoreMutation } from "@/hooks/customQuery";
 
 import { postLogout } from "@/api/auth/auth";
 import useAuthStore from "@/store/useAuthStore";
+import useWorkspaceStore from "@/store/useWorkspaceStore";
 
 export function useLogout() {
-  const nav = useNavigate();
   const logout = useAuthStore((s) => s.logout);
   const queryClient = useQueryClient();
 
@@ -18,8 +17,9 @@ export function useLogout() {
     userOnSuccess: () => {
       toast.success("로그아웃이 완료되었습니다");
       queryClient.clear();
+      useWorkspaceStore.getState().reset();
       logout();
-      nav("/", { replace: true });
+      window.location.replace("/");
     },
     userOnError: (error) => {
       const apiError = error as IApiErrorResponse;
diff --git a/src/layout/main/MainLayout.tsx b/src/layout/main/MainLayout.tsx
index 5b850984..d420afb2 100644
--- a/src/layout/main/MainLayout.tsx
+++ b/src/layout/main/MainLayout.tsx
@@ -44,6 +44,7 @@ export default function MainLayout() {
 
   const setSelectedOrgId = useWorkspaceStore((s) => s.setSelectedOrgId);
   const setMyRole = useWorkspaceStore((s) => s.setMyRole);
+  const resetWorkspace = useWorkspaceStore((s) => s.reset);
   const myRole = useWorkspaceStore((s) => s.myRole);
 
   const savedWorkspaceQuery = useCoreQuery(
@@ -66,21 +67,32 @@ export default function MainLayout() {
   );
 
   useEffect(() => {
-    if (!workspaces?.length || !savedWorkspaceQuery.isFetched) return;
+    // undefined: 로딩 중 / []: 워크스페이스 없음(유효한 결과)
+    if (!workspaces || !savedWorkspaceQuery.isFetched) return;
 
-    // orgId는 있는데 myRole만 null/불일치인 경우(새로고침 등) 역할 동기화
+    if (workspaces.length === 0) {
+      if (selectedOrgId !== null || myRole !== null) {
+        resetWorkspace();
+      }
+      return;
+    }
+
+    // 현재 유저 목록에 있는 orgId만 유지 (+ role 동기화)
+    // 목록에 없으면 return하지 않고 아래 saved/current 초기화로 계속
     if (selectedOrgId !== null) {
       const workspace = workspaces.find((w) => w.orgId === selectedOrgId);
-      if (workspace && myRole !== workspace.myRole) {
-        setMyRole(workspace.myRole);
+      if (workspace) {
+        if (myRole !== workspace.myRole) {
+          setMyRole(workspace.myRole);
+        }
+        return;
       }
-      return;
     }
 
     const savedId = savedData?.orgId;
     const isExist = workspaces.some((w) => w.orgId === savedId);
 
-    // 1. 현재 워크스페이스 조회 API 데이터 (저장된 워크스페이스가 있는 경우)
+    // 1. 저장된 워크스페이스가 현재 유저 목록에 있으면 선택
     if (savedId !== undefined && isExist) {
       const workspace = workspaces.find((w) => w.orgId === savedId);
       setSelectedOrgId(savedId);
@@ -99,6 +111,7 @@ export default function MainLayout() {
     savedData,
     setSelectedOrgId,
     setMyRole,
+    resetWorkspace,
     selectedOrgId,
     myRole,
   ]);
diff --git a/src/pages/auth/RedirectPage.tsx b/src/pages/auth/RedirectPage.tsx
index b9a7e41c..6671f560 100644
--- a/src/pages/auth/RedirectPage.tsx
+++ b/src/pages/auth/RedirectPage.tsx
@@ -8,7 +8,9 @@ import {
   getSafeReturnUrl,
 } from "@/utils/auth/returnUrl";
 
+import { queryClient } from "@/lib/queryClient";
 import useAuthStore from "@/store/useAuthStore";
+import useWorkspaceStore from "@/store/useWorkspaceStore";
 
 export default function RedirectPage() {
   const navigate = useNavigate();
@@ -37,6 +39,8 @@ export default function RedirectPage() {
 
     if (accessToken) {
       deleteCookie("access_token");
+      queryClient.clear();
+      useWorkspaceStore.getState().reset();
       setAccessToken(accessToken);
 
       toast.success("소셜 로그인되었습니다.");
diff --git a/src/store/useWorkspaceStore.ts b/src/store/useWorkspaceStore.ts
index 8d8288f0..c5671389 100644
--- a/src/store/useWorkspaceStore.ts
+++ b/src/store/useWorkspaceStore.ts
@@ -7,6 +7,7 @@ interface IWorkspaceState {
   myRole: TMemberRole | null;
   setSelectedOrgId: (orgId: number) => void;
   setMyRole: (role: TMemberRole | null) => void;
+  reset: () => void;
 }
 
 const useWorkspaceStore = create<IWorkspaceState>((set) => ({
@@ -14,6 +15,7 @@ const useWorkspaceStore = create<IWorkspaceState>((set) => ({
   myRole: null,
   setSelectedOrgId: (orgId) => set({ selectedOrgId: orgId }),
   setMyRole: (role) => set({ myRole: role }),
+  reset: () => set({ selectedOrgId: null, myRole: null }),
 }));
 
 export default useWorkspaceStore;