diff --git a/src/main/java/com/sumte/apiPayload/code/error/CommonErrorCode.java b/src/main/java/com/sumte/apiPayload/code/error/CommonErrorCode.java
index d9eb8c9..83fa4a9 100644
--- a/src/main/java/com/sumte/apiPayload/code/error/CommonErrorCode.java
+++ b/src/main/java/com/sumte/apiPayload/code/error/CommonErrorCode.java
@@ -18,22 +18,25 @@ public enum CommonErrorCode implements ErrorCode {
 	USER_NOT_FOUND(HttpStatus.NOT_FOUND, "COMMON404", "사용자를 찾을 수 없습니다"),
 	METHOD_NOT_ALLOWED(HttpStatus.METHOD_NOT_ALLOWED, "COMMON405", "허용되지 않는 HTTP Method입니다."),
 
-    // GUESTHOUSE4XX
-    DUPLICATE_DATA(HttpStatus.BAD_REQUEST, "GUESTHOUSE401", "중복된 게스트하우스 입니다."),
-    NOT_EXIST(HttpStatus.BAD_REQUEST, "GUESTHOUSE402", "존재하지 않는 게스트하우스 입니다."),
-    OPTIONSERVICE_NOT_EXIST(HttpStatus.BAD_REQUEST, "GUESTHOUSE403", "존재하지 않는 부가 서비스 입니다."),
-    TARGETAUDIENCE_NOT_EXIST(HttpStatus.BAD_REQUEST, "GUESTHOUSE404", "존재하지 않는 이용대상 입니다."),
+	// GUESTHOUSE4XX
+	DUPLICATE_DATA(HttpStatus.BAD_REQUEST, "GUESTHOUSE401", "중복된 게스트하우스 입니다."),
+	NOT_EXIST(HttpStatus.BAD_REQUEST, "GUESTHOUSE402", "존재하지 않는 게스트하우스 입니다."),
+	OPTIONSERVICE_NOT_EXIST(HttpStatus.BAD_REQUEST, "GUESTHOUSE403", "존재하지 않는 부가 서비스 입니다."),
+	TARGETAUDIENCE_NOT_EXIST(HttpStatus.BAD_REQUEST, "GUESTHOUSE404", "존재하지 않는 이용대상 입니다."),
 
-    // ROOM4XX
-    ALREADY_EXIST(HttpStatus.BAD_REQUEST, "ROOM401", "이미 같은 방이 존재합니다."),
-    NOT_EXIST_ROOM(HttpStatus.BAD_REQUEST, "ROOM402", "존재하지 않는 방입니다."),
+	// ROOM4XX
+	ALREADY_EXIST(HttpStatus.BAD_REQUEST, "ROOM401", "이미 같은 방이 존재합니다."),
+	NOT_EXIST_ROOM(HttpStatus.BAD_REQUEST, "ROOM402", "존재하지 않는 방입니다."),
 
 	// COMMON 5XX
 	INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "COMMON500", "서버 내부 오류입니다."),
 
-    // page 처리 관련
-    PAGE_UNDER_ONE(HttpStatus.BAD_REQUEST,"PAGE_4001","페이지는 1이상으로 입력해야 합니다."),
-    PAGE_SIZE_UNDER_ONE(HttpStatus.BAD_REQUEST,"PAGE_4002","페이지 사이즈는 1이상으로 입력해야 합니다.");
+	// page 처리 관련
+	PAGE_UNDER_ONE(HttpStatus.BAD_REQUEST, "PAGE_4001", "페이지는 1이상으로 입력해야 합니다."),
+	PAGE_SIZE_UNDER_ONE(HttpStatus.BAD_REQUEST, "PAGE_4002", "페이지 사이즈는 1이상으로 입력해야 합니다."),
+
+	//닉네임 중복
+	DUPLICATE_NICKNAME(HttpStatus.CONFLICT, "USER401", "이미 사용 중인 닉네임입니다.");
 
 	private final HttpStatus httpStatus;
 	private final String code;
diff --git a/src/main/java/com/sumte/apiPayload/code/error/SecurityErrorCode.java b/src/main/java/com/sumte/apiPayload/code/error/SecurityErrorCode.java
index b9b542c..9ef78fa 100644
--- a/src/main/java/com/sumte/apiPayload/code/error/SecurityErrorCode.java
+++ b/src/main/java/com/sumte/apiPayload/code/error/SecurityErrorCode.java
@@ -10,6 +10,7 @@
 public enum SecurityErrorCode implements ErrorCode {
 	IDENTIFIER_DUPLICATED(HttpStatus.BAD_REQUEST, "SECURITY400", "이미 존재하는 아이디입니다."),
 	NICKNAME_DUPLICATED(HttpStatus.BAD_REQUEST, "SECURITY400", "이미 존재하는 닉네임입니다."),
+	EMAIL_DUPLICATED(HttpStatus.BAD_REQUEST, "SECURITY400", "이미 존재하는 이메일입니다."),
 	;
 
 	private final HttpStatus httpStatus;
diff --git a/src/main/java/com/sumte/security/controller/SignUpController.java b/src/main/java/com/sumte/security/controller/SignUpController.java
index 4481be8..45a6258 100644
--- a/src/main/java/com/sumte/security/controller/SignUpController.java
+++ b/src/main/java/com/sumte/security/controller/SignUpController.java
@@ -46,4 +46,12 @@ public ResponseEntity<ApiResponse<String>> checkDuplicateNickname(@RequestParam(
 		signUpService.checkDuplicatedNickname(nickname);
 		return ResponseEntity.ok(ApiResponse.success("사용 가능한 닉네임입니다."));
 	}
+
+	@Operation(summary = "이메일 중복 확인 API", description = "이메일 중복 확인 API입니다.")
+	@GetMapping("/duplicate/email")
+	public ResponseEntity<ApiResponse<String>> checkDuplicateEmail(@RequestParam("email") String email) {
+		signUpService.checkDuplicatedEmail(email);
+		return ResponseEntity.ok(ApiResponse.success("사용 가능한 이메일입니다."));
+	}
+
 }
diff --git a/src/main/java/com/sumte/security/service/SignUpService.java b/src/main/java/com/sumte/security/service/SignUpService.java
index afa55e3..67ed6e2 100644
--- a/src/main/java/com/sumte/security/service/SignUpService.java
+++ b/src/main/java/com/sumte/security/service/SignUpService.java
@@ -39,4 +39,10 @@ public void checkDuplicatedNickname(String nickname) {
 			throw new SumteException(SecurityErrorCode.NICKNAME_DUPLICATED);
 		}
 	}
+
+	public void checkDuplicatedEmail(String email) {
+		if (userRepository.findByEmail(email).isPresent()) {
+			throw new SumteException(SecurityErrorCode.EMAIL_DUPLICATED);
+		}
+	}
 }
diff --git a/src/main/java/com/sumte/user/controller/UserController.java b/src/main/java/com/sumte/user/controller/UserController.java
index e51818c..6651e3f 100644
--- a/src/main/java/com/sumte/user/controller/UserController.java
+++ b/src/main/java/com/sumte/user/controller/UserController.java
@@ -3,16 +3,20 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
+import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
 import com.sumte.apiPayload.ApiResponse;
 import com.sumte.security.authorization.UserId;
+import com.sumte.user.dto.UserNicknameUpdateRequest;
 import com.sumte.user.dto.response.UserInfoResponse;
 import com.sumte.user.service.UserService;
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
@@ -42,4 +46,15 @@ public ResponseEntity<ApiResponse<Void>> deactivateUser(
 		userService.deactivateUser(userId);
 		return ResponseEntity.ok(ApiResponse.successWithNoData());
 	}
+
+	//닉네임 중복확인
+	@PatchMapping("/nickname")
+	@Operation(summary = "닉네임 수정 API", description = "사용자의 닉네임을 수정합니다.")
+	public ResponseEntity<Void> updateNickname(
+		@RequestBody @Valid UserNicknameUpdateRequest request,
+		@UserId Long userId
+	) {
+		userService.updateNickname(userId, request.nickname());
+		return ResponseEntity.ok().build();
+	}
 }
diff --git a/src/main/java/com/sumte/user/dto/UserNicknameUpdateRequest.java b/src/main/java/com/sumte/user/dto/UserNicknameUpdateRequest.java
new file mode 100644
index 0000000..23a06d0
--- /dev/null
+++ b/src/main/java/com/sumte/user/dto/UserNicknameUpdateRequest.java
@@ -0,0 +1,9 @@
+package com.sumte.user.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record UserNicknameUpdateRequest(
+	@NotBlank(message = "닉네임은 필수입니다.")
+	String nickname
+) {
+}
\ No newline at end of file
diff --git a/src/main/java/com/sumte/user/entity/User.java b/src/main/java/com/sumte/user/entity/User.java
index fc15a76..e4e693e 100644
--- a/src/main/java/com/sumte/user/entity/User.java
+++ b/src/main/java/com/sumte/user/entity/User.java
@@ -64,4 +64,8 @@ public User(String loginId, String password, String name, String nickname, Strin
 		this.email = email;
 		this.status = status;
 	}
+	
+	public void updateNickname(String nickname) {
+		this.nickname = nickname;
+	}
 }
diff --git a/src/main/java/com/sumte/user/repository/UserRepository.java b/src/main/java/com/sumte/user/repository/UserRepository.java
index 024a7bc..a5e6b6e 100644
--- a/src/main/java/com/sumte/user/repository/UserRepository.java
+++ b/src/main/java/com/sumte/user/repository/UserRepository.java
@@ -9,7 +9,9 @@
 
 @Repository
 public interface UserRepository extends JpaRepository<User, Long> {
-    Optional<User> findByLoginId(String loginId);
+	Optional<User> findByLoginId(String loginId);
 
-    Optional<User> findByNickname(String nickName);
+	Optional<User> findByNickname(String nickName);
+
+	Optional<User> findByEmail(String email);
 }
diff --git a/src/main/java/com/sumte/user/service/UserService.java b/src/main/java/com/sumte/user/service/UserService.java
index 76915ce..6ed45e3 100644
--- a/src/main/java/com/sumte/user/service/UserService.java
+++ b/src/main/java/com/sumte/user/service/UserService.java
@@ -35,4 +35,19 @@ public void deactivateUser(Long userId) {
 
 		user.deactivate();
 	}
+
+	// 닉네임 수정
+	@Transactional
+	public void updateNickname(Long userId, String nickname) {
+		// 중복검사를 위함
+		userRepository.findByNickname(nickname).ifPresent(user -> {
+			throw new SumteException(CommonErrorCode.DUPLICATE_NICKNAME);
+		});
+
+		// 사용자 조회해서 닉네임 변경하기
+		User user = userRepository.findById(userId)
+			.orElseThrow(() -> new SumteException(CommonErrorCode.USER_NOT_FOUND));
+
+		user.updateNickname(nickname);
+	}
 }