diff --git a/apps/web/src/app/login/kakao/callback/KakaoLoginCallbackPage.tsx b/apps/web/src/app/login/kakao/callback/KakaoLoginCallbackPage.tsx
index d10775e0..d20d13ec 100644
--- a/apps/web/src/app/login/kakao/callback/KakaoLoginCallbackPage.tsx
+++ b/apps/web/src/app/login/kakao/callback/KakaoLoginCallbackPage.tsx
@@ -5,16 +5,26 @@ import { useEffect } from "react";
 import { usePostKakaoAuth } from "@/apis/Auth";
 import CloudSpinnerPage from "@/components/ui/CloudSpinnerPage";
 
+const attemptedKakaoAuthCodes = new Set<string>();
+
 const KakaoLoginCallbackPage = () => {
   const searchParams = useSearchParams();
   const { mutate: postKakaoAuth } = usePostKakaoAuth();
+  const code = searchParams?.get("code");
 
   useEffect(() => {
-    const code = searchParams?.get("code");
-    if (code) {
-      postKakaoAuth({ code });
+    if (!code) {
+      return;
+    }
+
+    // Strict Mode remount/useEffect 재실행 시 동일 인가코드 중복 호출 방지
+    if (attemptedKakaoAuthCodes.has(code)) {
+      return;
     }
-  }, [searchParams, postKakaoAuth]);
+
+    attemptedKakaoAuthCodes.add(code);
+    postKakaoAuth({ code });
+  }, [code, postKakaoAuth]);
 
   return <CloudSpinnerPage />;
 };