diff --git a/src/main/java/org/sopt/seonyakServer/domain/member/controller/MemberController.java b/src/main/java/org/sopt/seonyakServer/domain/member/controller/MemberController.java
index 3439abd..9d43b17 100644
--- a/src/main/java/org/sopt/seonyakServer/domain/member/controller/MemberController.java
+++ b/src/main/java/org/sopt/seonyakServer/domain/member/controller/MemberController.java
@@ -3,6 +3,7 @@
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.sopt.seonyakServer.domain.member.dto.LoginSuccessResponse;
+import org.sopt.seonyakServer.domain.member.dto.NicknameRequest;
 import org.sopt.seonyakServer.domain.member.service.MemberService;
 import org.sopt.seonyakServer.global.common.external.client.dto.MemberLoginRequest;
 import org.springframework.http.ResponseEntity;
@@ -14,16 +15,25 @@
 
 @RestController
 @RequiredArgsConstructor
-@RequestMapping("/api/v1/auth")
+@RequestMapping("/api/v1")
 public class MemberController {
 
     private final MemberService memberService;
 
-    @PostMapping("/login")
+    @PostMapping("/auth/login")
     public ResponseEntity<LoginSuccessResponse> login(
             @RequestParam final String authorizationCode,
             @RequestBody @Valid final MemberLoginRequest loginRequest
     ) {
         return ResponseEntity.ok(memberService.create(authorizationCode, loginRequest));
     }
+
+    @PostMapping("/nickname")
+    public ResponseEntity<Void> validNickname(
+            @RequestBody final NicknameRequest nicknameRequest
+    ) {
+        memberService.validNickname(nicknameRequest);
+
+        return ResponseEntity.ok().build();
+    }
 }
diff --git a/src/main/java/org/sopt/seonyakServer/domain/member/dto/NicknameRequest.java b/src/main/java/org/sopt/seonyakServer/domain/member/dto/NicknameRequest.java
new file mode 100644
index 0000000..5766b87
--- /dev/null
+++ b/src/main/java/org/sopt/seonyakServer/domain/member/dto/NicknameRequest.java
@@ -0,0 +1,9 @@
+package org.sopt.seonyakServer.domain.member.dto;
+
+public record NicknameRequest(
+        String nickname
+) {
+    public static NicknameRequest of(final String nickname) {
+        return new NicknameRequest(nickname);
+    }
+}
diff --git a/src/main/java/org/sopt/seonyakServer/domain/member/repository/MemberRepository.java b/src/main/java/org/sopt/seonyakServer/domain/member/repository/MemberRepository.java
index a5b91d8..48c4850 100644
--- a/src/main/java/org/sopt/seonyakServer/domain/member/repository/MemberRepository.java
+++ b/src/main/java/org/sopt/seonyakServer/domain/member/repository/MemberRepository.java
@@ -7,4 +7,6 @@
 
 public interface MemberRepository extends JpaRepository<Member, Long> {
     Optional<Member> findBySocialTypeAndSocialId(SocialType socialType, String socialId);
+
+    boolean existsByNickname(String nickname);
 }
diff --git a/src/main/java/org/sopt/seonyakServer/domain/member/service/MemberService.java b/src/main/java/org/sopt/seonyakServer/domain/member/service/MemberService.java
index fdcf52c..97f954d 100644
--- a/src/main/java/org/sopt/seonyakServer/domain/member/service/MemberService.java
+++ b/src/main/java/org/sopt/seonyakServer/domain/member/service/MemberService.java
@@ -2,6 +2,7 @@
 
 import lombok.RequiredArgsConstructor;
 import org.sopt.seonyakServer.domain.member.dto.LoginSuccessResponse;
+import org.sopt.seonyakServer.domain.member.dto.NicknameRequest;
 import org.sopt.seonyakServer.domain.member.model.Member;
 import org.sopt.seonyakServer.domain.member.model.SocialType;
 import org.sopt.seonyakServer.domain.member.repository.MemberRepository;
@@ -24,6 +25,8 @@ public class MemberService {
     private final GoogleSocialService googleSocialService;
     private final MemberManagementService memberManagementService;
 
+    public static final String NICKNAME_PATTERN = "^[a-zA-Z0-9가-힣]{2,8}$";
+
     // JWT Access Token 생성
     public LoginSuccessResponse create(
             final String authorizationCode,
@@ -87,4 +90,15 @@ public LoginSuccessResponse getTokenByMemberId(final Long id) {
 
         return LoginSuccessResponse.of(jwtTokenProvider.issueAccessToken(memberAuthentication));
     }
+
+    // 닉네임 유효성 검증
+    public void validNickname(final NicknameRequest nicknameRequest) {
+        if (!nicknameRequest.nickname().matches(NICKNAME_PATTERN)) { // 형식 체크
+            throw new CustomException(ErrorType.INVALID_NICKNAME_ERROR);
+        }
+
+        if (memberRepository.existsByNickname(nicknameRequest.nickname())) { // 중복 체크
+            throw new CustomException(ErrorType.NICKNAME_DUP_ERROR);
+        }
+    }
 }
diff --git a/src/main/java/org/sopt/seonyakServer/global/exception/enums/ErrorType.java b/src/main/java/org/sopt/seonyakServer/global/exception/enums/ErrorType.java
index e328d60..d6e9ab2 100644
--- a/src/main/java/org/sopt/seonyakServer/global/exception/enums/ErrorType.java
+++ b/src/main/java/org/sopt/seonyakServer/global/exception/enums/ErrorType.java
@@ -22,6 +22,7 @@ public enum ErrorType {
     INVALID_CODE_HEADER_ERROR(HttpStatus.BAD_REQUEST, "40007", "code 헤더값의 형식이 잘못되었습니다."),
     INVALID_SOCIAL_TYPE_ERROR(HttpStatus.BAD_REQUEST, "40008", "유효하지 않은 Social Type입니다."),
     BEARER_LOST_ERROR(HttpStatus.BAD_REQUEST, "40009", "요청한 토큰이 Bearer 토큰이 아닙니다."),
+    INVALID_NICKNAME_ERROR(HttpStatus.BAD_REQUEST, "40010", "닉네임이 조건을 만족하지 않습니다."),
     MAP_TO_JSON_ERROR(HttpStatus.BAD_REQUEST, "40016", "Map을 JSON 문자열로 변환하는 중 오류가 발생했습니다."),
     JSON_TO_MAP_ERROR(HttpStatus.BAD_REQUEST, "40017", "JSON 문자열을 Map으로 변환하는 중 오류가 발생했습니다."),