diff --git a/apps/web/src/app/university/application/_components/ApplicationBottomActionBar.tsx b/apps/web/src/app/university/application/_components/ApplicationBottomActionBar.tsx
index 7b97e940..02a2b536 100644
--- a/apps/web/src/app/university/application/_components/ApplicationBottomActionBar.tsx
+++ b/apps/web/src/app/university/application/_components/ApplicationBottomActionBar.tsx
@@ -3,12 +3,15 @@ import BlockBtn from "@/components/button/BlockBtn";
 type ApplicationBottomActionBarProps = {
   label: string;
   onClick: () => void;
+  disabled?: boolean;
 };
 
-const ApplicationBottomActionBar = ({ label, onClick }: ApplicationBottomActionBarProps) => {
+const ApplicationBottomActionBar = ({ label, onClick, disabled = false }: ApplicationBottomActionBarProps) => {
   return (
     <div className="fixed bottom-[78px] left-1/2 w-full max-w-app -translate-x-1/2 px-5">
-      <BlockBtn onClick={onClick}>{label}</BlockBtn>
+      <BlockBtn onClick={onClick} disabled={disabled}>
+        {label}
+      </BlockBtn>
     </div>
   );
 };
diff --git a/apps/web/src/app/university/application/apply/ApplyPageContent.tsx b/apps/web/src/app/university/application/apply/ApplyPageContent.tsx
index 266cbe8a..5b23ce44 100644
--- a/apps/web/src/app/university/application/apply/ApplyPageContent.tsx
+++ b/apps/web/src/app/university/application/apply/ApplyPageContent.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import { useRouter } from "next/navigation";
-import { useEffect, useMemo, useState } from "react";
+import { useEffect, useMemo, useRef, useState } from "react";
 import { usePostSubmitApplication } from "@/apis/applications";
 import { useGetMyGpaScore, useGetMyLanguageTestScore } from "@/apis/Scores";
 import { useUniversitySearch } from "@/apis/universities";
@@ -41,7 +41,8 @@ const ApplyPageContent = () => {
   // TODO: 서버의 모학교 미인증 에러 코드가 확정되면 GPA 조회 실패 시 학교 인증으로 보내는 fallback을 추가한다.
   const { data: gpaScoreData } = useGetMyGpaScore({ enabled: shouldFetchGpaScore });
   const { data: languageTestScoreList = [] } = useGetMyLanguageTestScore();
-  const { mutate: postSubmitApplication } = usePostSubmitApplication({
+  const isSubmitLockedRef = useRef(false);
+  const { mutate: postSubmitApplication, isPending: isSubmitApplicationPending } = usePostSubmitApplication({
     onSuccess: () => {
       setStep(99);
     },
@@ -70,6 +71,10 @@ const ApplyPageContent = () => {
   };
 
   const handleSubmit = async () => {
+    if (isSubmitLockedRef.current || isSubmitApplicationPending) {
+      return;
+    }
+
     if (curGpaScore === null) {
       showIconToast("logo", "GPA를 선택해주세요.");
       return;
@@ -89,13 +94,21 @@ const ApplyPageContent = () => {
       return;
     }
 
-    postSubmitApplication({
-      gpaScoreId: curGpaScore,
-      languageTestScoreId: curLanguageTestScore,
-      universityChoiceRequest: {
-        choices: selectedUniversityIds,
+    isSubmitLockedRef.current = true;
+    postSubmitApplication(
+      {
+        gpaScoreId: curGpaScore,
+        languageTestScoreId: curLanguageTestScore,
+        universityChoiceRequest: {
+          choices: selectedUniversityIds,
+        },
+      },
+      {
+        onSettled: () => {
+          isSubmitLockedRef.current = false;
+        },
       },
-    });
+    );
   };
 
   const gpaScoreList = gpaScoreData?.gpaScoreStatusResponseList ?? [];
@@ -154,6 +167,7 @@ const ApplyPageContent = () => {
                   .filter(Boolean) as ListUniversity[]
               }
               onNext={handleSubmit}
+              isSubmitting={isSubmitApplicationPending}
             />
           )}
           {step === 99 && <DoneStep />}
diff --git a/apps/web/src/app/university/application/apply/ConfirmStep.tsx b/apps/web/src/app/university/application/apply/ConfirmStep.tsx
index cd8fa7a6..94386890 100644
--- a/apps/web/src/app/university/application/apply/ConfirmStep.tsx
+++ b/apps/web/src/app/university/application/apply/ConfirmStep.tsx
@@ -7,6 +7,7 @@ import ApplicationBottomActionBar from "../_components/ApplicationBottomActionBa
 type ConfirmStepProps = {
   universityList: ListUniversity[];
   onNext: () => void;
+  isSubmitting?: boolean;
 };
 
 type ConfirmUniversityCardProps = {
@@ -38,7 +39,7 @@ const ConfirmUniversityCard = ({ universityList }: ConfirmUniversityCardProps) =
   );
 };
 
-const ConfirmStep = ({ universityList, onNext }: ConfirmStepProps) => {
+const ConfirmStep = ({ universityList, onNext, isSubmitting = false }: ConfirmStepProps) => {
   return (
     <div className="px-5 pb-40 pt-[76px]">
       <div className="flex items-center justify-center">
@@ -55,7 +56,7 @@ const ConfirmStep = ({ universityList, onNext }: ConfirmStepProps) => {
       </div>
 
       <ConfirmUniversityCard universityList={universityList} />
-      <ApplicationBottomActionBar label="제출하기" onClick={onNext} />
+      <ApplicationBottomActionBar label="제출하기" onClick={onNext} disabled={isSubmitting} />
     </div>
   );
 };
diff --git a/apps/web/src/app/university/score/submit/gpa/GpaSubmitForm.tsx b/apps/web/src/app/university/score/submit/gpa/GpaSubmitForm.tsx
index 59b21999..a641d549 100644
--- a/apps/web/src/app/university/score/submit/gpa/GpaSubmitForm.tsx
+++ b/apps/web/src/app/university/score/submit/gpa/GpaSubmitForm.tsx
@@ -4,7 +4,7 @@ import { zodResolver } from "@hookform/resolvers/zod";
 import clsx from "clsx";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
-import { Suspense, useEffect, useState } from "react";
+import { Suspense, useEffect, useRef, useState } from "react";
 import { Controller, type SubmitHandler, useForm } from "react-hook-form";
 import { usePostGpaScore } from "@/apis/Scores";
 import { getSchoolEmailVerificationPath } from "@/app/my/school-email/_lib/returnTo";
@@ -22,7 +22,8 @@ const GpaSubmitForm = () => {
   const isAuthenticated = useAuthStore((state) => state.isAuthenticated);
   const [showResult, setShowResult] = useState(false);
   const [submittedData, setSubmittedData] = useState<GpaFormData | null>(null);
-  const { mutateAsync: postGpaScore } = usePostGpaScore();
+  const isSubmitLockedRef = useRef(false);
+  const { mutateAsync: postGpaScore, isPending: isPostGpaScorePending } = usePostGpaScore();
 
   // 2. react-hook-form 설정
   const {
@@ -31,12 +32,13 @@ const GpaSubmitForm = () => {
     control,
     watch,
     reset,
-    formState: { errors, isValid },
+    formState: { errors, isSubmitting, isValid },
   } = useForm<GpaFormData>({
     resolver: zodResolver(gpaSchema),
     mode: "onChange",
   });
   const selectedFile = watch("file");
+  const isSubmitDisabled = !isValid || isSubmitting || isPostGpaScorePending;
 
   useEffect(() => {
     if (!isAuthInitialized || !isAuthenticated || homeUniversityId !== null) {
@@ -52,18 +54,27 @@ const GpaSubmitForm = () => {
 
   // 3. 폼 제출 핸들러
   const onSubmit: SubmitHandler<GpaFormData> = async (data) => {
-    await postGpaScore({
-      gpaScoreRequest: {
-        gpa: Number(data.gpa),
-        gpaCriteria: Number(data.gpaCriteria),
-        issueDate: "2025-01-01", // TODO: 실제 날짜 데이터로 변경
-      },
-      file: data.file[0],
-    });
-    // 성공 시, 결과 화면에 보여줄 데이터를 저장하고 상태 변경
-    setSubmittedData(data);
-    setShowResult(true);
-    reset();
+    if (isSubmitLockedRef.current) return;
+
+    isSubmitLockedRef.current = true;
+    try {
+      await postGpaScore({
+        gpaScoreRequest: {
+          gpa: Number(data.gpa),
+          gpaCriteria: Number(data.gpaCriteria),
+          issueDate: "2025-01-01", // TODO: 실제 날짜 데이터로 변경
+        },
+        file: data.file[0],
+      });
+      // 성공 시, 결과 화면에 보여줄 데이터를 저장하고 상태 변경
+      setSubmittedData(data);
+      setShowResult(true);
+      reset();
+    } catch (_error) {
+      // 실패 토스트는 React Query 전역 onError에서 단일 처리
+    } finally {
+      isSubmitLockedRef.current = false;
+    }
   };
 
   if (showResult && submittedData) {
@@ -175,9 +186,9 @@ const GpaSubmitForm = () => {
           <button
             className={clsx(
               "mb-10 w-full rounded-lg py-4 text-white typo-sb-9",
-              isValid ? "bg-primary" : "cursor-not-allowed bg-k-100",
+              isSubmitDisabled ? "cursor-not-allowed bg-k-100" : "bg-primary",
             )}
-            disabled={!isValid}
+            disabled={isSubmitDisabled}
           >
             다음
           </button>
diff --git a/apps/web/src/app/university/score/submit/language-test/LanguageTestSubmitForm.tsx b/apps/web/src/app/university/score/submit/language-test/LanguageTestSubmitForm.tsx
index 18e3072c..219ec305 100644
--- a/apps/web/src/app/university/score/submit/language-test/LanguageTestSubmitForm.tsx
+++ b/apps/web/src/app/university/score/submit/language-test/LanguageTestSubmitForm.tsx
@@ -4,7 +4,7 @@ import { zodResolver } from "@hookform/resolvers/zod";
 import clsx from "clsx";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
-import { Suspense, useState } from "react";
+import { Suspense, useRef, useState } from "react";
 import { Controller, type SubmitHandler, useForm } from "react-hook-form";
 import { usePostLanguageTestScore } from "@/apis/Scores";
 import SubmitLinkTab from "@/components/score/SubmitLinkTab";
@@ -17,7 +17,8 @@ import { type LanguageTestFormData, languageTestSchema } from "./_lib/schema";
 const LanguageTestSubmitForm = () => {
   const router = useRouter();
   const [showResult, setShowResult] = useState(false);
-  const { mutateAsync: postLanguageTestScore } = usePostLanguageTestScore();
+  const isSubmitLockedRef = useRef(false);
+  const { mutateAsync: postLanguageTestScore, isPending: isPostLanguageTestScorePending } = usePostLanguageTestScore();
   const [submittedData, setSubmittedData] = useState<LanguageTestFormData | null>(null);
 
   // 3. react-hook-form 설정
@@ -27,16 +28,20 @@ const LanguageTestSubmitForm = () => {
     control,
     watch,
     reset,
-    formState: { errors, isValid },
+    formState: { errors, isSubmitting, isValid },
   } = useForm<LanguageTestFormData>({
     resolver: zodResolver(languageTestSchema),
     mode: "onChange", // 입력값이 변경될 때마다 유효성 검사
   });
 
   const selectedFile = watch("file");
+  const isSubmitDisabled = !isValid || isSubmitting || isPostLanguageTestScorePending;
 
   // 4. 폼 제출 핸들러
   const onSubmit: SubmitHandler<LanguageTestFormData> = async (data) => {
+    if (isSubmitLockedRef.current) return;
+
+    isSubmitLockedRef.current = true;
     try {
       await postLanguageTestScore({
         languageTestScoreRequest: {
@@ -53,6 +58,8 @@ const LanguageTestSubmitForm = () => {
       setSubmittedData(data);
     } catch (_error) {
       // 실패 토스트는 React Query 전역 onError에서 단일 처리
+    } finally {
+      isSubmitLockedRef.current = false;
     }
   };
 
@@ -162,9 +169,9 @@ const LanguageTestSubmitForm = () => {
           <button
             className={clsx(
               "mb-10 w-full rounded-lg py-4 text-white typo-sb-9",
-              isValid ? "bg-primary" : "cursor-not-allowed bg-k-100",
+              isSubmitDisabled ? "cursor-not-allowed bg-k-100" : "bg-primary",
             )}
-            disabled={!isValid}
+            disabled={isSubmitDisabled}
           >
             다음
           </button>