diff --git a/src/main/java/com/moongeul/backend/api/member/controller/MemberController.java b/src/main/java/com/moongeul/backend/api/member/controller/MemberController.java
index c5ad59b..473d09c 100644
--- a/src/main/java/com/moongeul/backend/api/member/controller/MemberController.java
+++ b/src/main/java/com/moongeul/backend/api/member/controller/MemberController.java
@@ -3,6 +3,7 @@
 import com.moongeul.backend.api.member.dto.LoginResponseDTO;
 import com.moongeul.backend.api.member.dto.LoginRequestDTO;
 import com.moongeul.backend.api.member.dto.UserInfoDTO;
+import com.moongeul.backend.api.member.jwt.dto.JwtTokenDTO;
 import com.moongeul.backend.api.member.service.MemberService;
 import com.moongeul.backend.common.response.ApiResponse;
 import com.moongeul.backend.common.response.SuccessStatus;
@@ -71,5 +72,20 @@ public ResponseEntity<ApiResponse<UserInfoDTO>> getUserInfo(@AuthenticationPrinc
         UserInfoDTO response = memberService.getUserInfo(userDetails.getUsername());
         return ApiResponse.success(SuccessStatus.GET_USERINFO_SUCCESS, response);
     }
+
+    @Operation(
+            summary = "토큰 재발급 API",
+            description = "엑세스 토큰 만료 시, 유효한 리프레시 토큰을 통해 엑세스 토큰을 재발급 받습니다."
+    )
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "토큰 재발급 성공"),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "401", description = "토큰이 만료되었거나 유효하지 않은 토큰입니다."),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "404", description = "해당 사용자를 찾을 수 없습니다.")
+    })
+    @GetMapping("/reissue-token")
+    public ResponseEntity<ApiResponse<JwtTokenDTO>> reissueAccessToken(@RequestHeader(value = "Authorization-Refresh") String refreshToken){
+        JwtTokenDTO response = memberService.reissueToken(refreshToken);
+        return ApiResponse.success(SuccessStatus.REISSUE_TOKEN_SUCCESS, response);
+    }
     
 }
diff --git a/src/main/java/com/moongeul/backend/api/member/repository/MemberRepository.java b/src/main/java/com/moongeul/backend/api/member/repository/MemberRepository.java
index 360c430..31d517d 100644
--- a/src/main/java/com/moongeul/backend/api/member/repository/MemberRepository.java
+++ b/src/main/java/com/moongeul/backend/api/member/repository/MemberRepository.java
@@ -10,4 +10,6 @@ public interface MemberRepository extends JpaRepository<Member, Long> {
     Optional<Member> findByEmail(String email);
 
     Optional<Member> findBySocialId(String socialId);
+
+    Optional<Member> findByRefreshToken(String refreshToken);
 }
diff --git a/src/main/java/com/moongeul/backend/api/member/service/MemberService.java b/src/main/java/com/moongeul/backend/api/member/service/MemberService.java
index b60582e..63cfd9a 100644
--- a/src/main/java/com/moongeul/backend/api/member/service/MemberService.java
+++ b/src/main/java/com/moongeul/backend/api/member/service/MemberService.java
@@ -7,6 +7,7 @@
 import com.moongeul.backend.api.member.repository.MemberRepository;
 import com.moongeul.backend.common.config.jwt.JwtTokenProvider;
 import com.moongeul.backend.common.exception.NotFoundException;
+import com.moongeul.backend.common.exception.UnauthorizedException;
 import com.moongeul.backend.common.response.ErrorStatus;
 import org.springframework.transaction.annotation.Transactional;
 import lombok.RequiredArgsConstructor;
@@ -117,4 +118,27 @@ private Member getMemberByEmail(String email) {
         return memberRepository.findByEmail(email)
                 .orElseThrow(() -> new NotFoundException(ErrorStatus.USER_NOTFOUND_EXCEPTION.getMessage()));
     }
+
+    @Transactional
+    public JwtTokenDTO reissueToken(String refreshToken){
+
+        // 1. Refresh Token 유효성 검증
+        if(!jwtTokenProvider.validateToken(refreshToken)){
+            throw new UnauthorizedException(ErrorStatus.TOKEN_UNAUTHORIZED.getMessage());
+        }
+
+        // 2. DB에서 해당 Refresh Token을 가진 회원 찾기
+        Member member = memberRepository.findByRefreshToken(refreshToken)
+                .orElseThrow(() -> new NotFoundException(ErrorStatus.USER_NOTFOUND_EXCEPTION.getMessage()));
+
+        // 3. 토큰 재발급 (Access/Refresh)
+        JwtTokenDTO jwtToken = jwtTokenProvider.generateToken(member);
+
+        // 4. DB에 새로 발급한 Refresh Token 저장
+        member.updateRefreshToken(jwtToken.getRefreshToken());
+        memberRepository.save(member);
+
+        // 5. 재발급 토큰 반환
+        return jwtToken;
+    }
 }
diff --git a/src/main/java/com/moongeul/backend/common/config/jwt/JwtTokenProvider.java b/src/main/java/com/moongeul/backend/common/config/jwt/JwtTokenProvider.java
index db67875..8a6d902 100644
--- a/src/main/java/com/moongeul/backend/common/config/jwt/JwtTokenProvider.java
+++ b/src/main/java/com/moongeul/backend/common/config/jwt/JwtTokenProvider.java
@@ -77,21 +77,25 @@ public JwtTokenDTO generateToken(Member member) {
     }
 
     // 토큰 정보를 검증하는 메서드
-    // 3. 신분증 검사 : 제출하는 액세스 토큰이 진짜인지 확인
+    // 3. 신분증 검사 : 제출하는 토큰이 진짜인지 확인
     public boolean validateToken(String token) {
         try {
             Jwts.parser()
-                    .verifyWith(key)
+                    .verifyWith(key)            // 서명(signature) 검증 : Header + Payload를 key로 다시 서명하여 생성한 값과 토큰의 Signature를 비교
                     .build()
-                    .parseSignedClaims(token);
+                    .parseSignedClaims(token);  // 만료 시간 확인 : Payload의 exp (expiration) claim과 현재 시간 비교
             return true;
         } catch (SecurityException | MalformedJwtException e) {
+            // 서명이 잘못되었거나 JWT 형식이 올바르지 않음
             log.info("Invalid JWT Token", e);
         } catch (ExpiredJwtException e) {
+            // 토큰이 만료됨 (exp < 현재시간)
             log.info("Expired JWT Token", e);
         } catch (UnsupportedJwtException e) {
+            // 지원하지 않는 서명 알고리즘 또는 JWT 타입
             log.info("Unsupported JWT Token", e);
         } catch (IllegalArgumentException e) {
+            // 토큰이 null이거나 빈 문자열
             log.info("JWT claims string is empty.", e);
         }
         return false;
diff --git a/src/main/java/com/moongeul/backend/common/config/oauth2/SecurityConfig.java b/src/main/java/com/moongeul/backend/common/config/oauth2/SecurityConfig.java
index e85412b..4c4f015 100644
--- a/src/main/java/com/moongeul/backend/common/config/oauth2/SecurityConfig.java
+++ b/src/main/java/com/moongeul/backend/common/config/oauth2/SecurityConfig.java
@@ -31,8 +31,9 @@ public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
                 .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS)) // 무상태 설정
                 .headers(headers -> headers.frameOptions(frameOptions -> frameOptions.disable())) //h2-console 화면 깨짐 방지(iframe 렌더링 오류)
                 .authorizeHttpRequests(auth -> auth
-                        .requestMatchers("/", "/api/v2/member/google/login", "/api/v2/member/kakao/login", "/h2-console/**").permitAll()
+                        .requestMatchers("/", "/h2-console/**").permitAll()
                         .requestMatchers("/v3/api-docs/**", "/api-doc/**", "/swagger-ui/**").permitAll()
+                        .requestMatchers("/api/v2/member/google/login", "/api/v2/member/kakao/login", "api/v2/member/reissue-token").permitAll()
                         .anyRequest().authenticated()
                 );
 
diff --git a/src/main/java/com/moongeul/backend/common/response/ErrorStatus.java b/src/main/java/com/moongeul/backend/common/response/ErrorStatus.java
index 2779c0f..eb32a4b 100644
--- a/src/main/java/com/moongeul/backend/common/response/ErrorStatus.java
+++ b/src/main/java/com/moongeul/backend/common/response/ErrorStatus.java
@@ -23,6 +23,7 @@ public enum ErrorStatus {
      * 401 UNAUTHORIZED
      */
     AUTH_UNAUTHORIZED(HttpStatus.UNAUTHORIZED, "유효하지 않은 인가코드 입니다."),
+    TOKEN_UNAUTHORIZED(HttpStatus.UNAUTHORIZED, "토큰이 만료되었거나 유효하지 않은 토큰입니다."),
 
     /**
      * 404 NOT_FOUND
diff --git a/src/main/java/com/moongeul/backend/common/response/SuccessStatus.java b/src/main/java/com/moongeul/backend/common/response/SuccessStatus.java
index 83b47d1..60885d9 100644
--- a/src/main/java/com/moongeul/backend/common/response/SuccessStatus.java
+++ b/src/main/java/com/moongeul/backend/common/response/SuccessStatus.java
@@ -14,7 +14,8 @@ public enum SuccessStatus {
 	 */
 	SEND_HEALTH_CHECK_SUCCESS(HttpStatus.OK,"서버 상태 체크 성공"),
 	SEND_LOGIN_SUCCESS(HttpStatus.OK, "로그인 성공"),
-	GET_USERINFO_SUCCESS(HttpStatus.OK, "사용자 정보 조회 성공")
+	GET_USERINFO_SUCCESS(HttpStatus.OK, "사용자 정보 조회 성공"),
+	REISSUE_TOKEN_SUCCESS(HttpStatus.OK, "토큰 재발급 성공")
 
 	/**
 	 * 201