diff --git a/devfront/src/features/auth/AuthCallbackPage.tsx b/devfront/src/features/auth/AuthCallbackPage.tsx
index 638a7924..339dade5 100644
--- a/devfront/src/features/auth/AuthCallbackPage.tsx
+++ b/devfront/src/features/auth/AuthCallbackPage.tsx
@@ -1,12 +1,19 @@
 import { useEffect } from "react";
 import { useAuth } from "react-oidc-context";
 import { useNavigate } from "react-router-dom";
+import { userManager } from "../../lib/auth";
 
 export default function AuthCallbackPage() {
   const auth = useAuth();
   const navigate = useNavigate();
 
   useEffect(() => {
+    // 팝업으로 열린 경우 signinPopupCallback 처리
+    if (window.opener) {
+      userManager.signinPopupCallback();
+      return;
+    }
+
     if (auth.isAuthenticated) {
       navigate("/", { replace: true });
     } else if (auth.error) {
diff --git a/devfront/src/features/auth/LoginPage.tsx b/devfront/src/features/auth/LoginPage.tsx
index 7004f4eb..4d592b68 100644
--- a/devfront/src/features/auth/LoginPage.tsx
+++ b/devfront/src/features/auth/LoginPage.tsx
@@ -1,5 +1,6 @@
 import { ExternalLink, LogIn, ShieldHalf } from "lucide-react";
 import { useAuth } from "react-oidc-context";
+import { useNavigate } from "react-router-dom";
 import { Button } from "../../components/ui/button";
 import {
   Card,
@@ -11,10 +12,15 @@ import {
 
 function LoginPage() {
   const auth = useAuth();
+  const navigate = useNavigate();
 
-  const handleSSOLogin = () => {
-    // OIDC client-side authentication flow started here
-    auth.signinRedirect();
+  const handleSSOLogin = async () => {
+    try {
+      await auth.signinPopup();
+      navigate("/clients", { replace: true });
+    } catch (error) {
+      console.error("Popup login failed", error);
+    }
   };
 
   return (
diff --git a/devfront/src/lib/apiClient.ts b/devfront/src/lib/apiClient.ts
index fd7cf54f..65a6995c 100644
--- a/devfront/src/lib/apiClient.ts
+++ b/devfront/src/lib/apiClient.ts
@@ -30,8 +30,9 @@ apiClient.interceptors.response.use(
     if (error.response?.status === 401) {
       // 401 발생 시 로그인 페이지로 리다이렉트
       const isAuthPath = window.location.pathname.startsWith("/callback");
-      if (!isAuthPath) {
-        userManager.signinRedirect();
+      const isLoginPath = window.location.pathname === "/login";
+      if (!isAuthPath && !isLoginPath) {
+        window.location.href = "/login";
       }
     }
     return Promise.reject(error);
diff --git a/devfront/src/lib/auth.ts b/devfront/src/lib/auth.ts
index 90453199..f424d9d9 100644
--- a/devfront/src/lib/auth.ts
+++ b/devfront/src/lib/auth.ts
@@ -9,6 +9,7 @@ export const oidcConfig: AuthProviderProps = {
   response_type: "code",
   scope: "openid offline_access profile email", // offline_access for refresh token
   post_logout_redirect_uri: window.location.origin,
+  popup_redirect_uri: `${window.location.origin}/auth/callback`,
   userStore: new WebStorageStateStore({ store: window.localStorage }),
   automaticSilentRenew: true,
 };