diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..1529fa8
Binary files /dev/null and b/.DS_Store differ
diff --git a/src/.DS_Store b/src/.DS_Store
new file mode 100644
index 0000000..a77576f
Binary files /dev/null and b/src/.DS_Store differ
diff --git a/src/main/java/doit/apihw/api/controller/MemberController.java b/src/main/java/doit/apihw/api/controller/MemberController.java
index d1e5890..855a985 100644
--- a/src/main/java/doit/apihw/api/controller/MemberController.java
+++ b/src/main/java/doit/apihw/api/controller/MemberController.java
@@ -11,6 +11,7 @@
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
+import org.springframework.http.ResponseEntity;
 
 @RestController
 @RequiredArgsConstructor
@@ -51,5 +52,11 @@ public void changePassword(@PathVariable Long memberId, @RequestBody AuthPasswor
     }
 
     // TODO : 자유 주제로 API를 추가로 구현해보세요.
-
+    @PostMapping("/members/{memberId}/name")
+    public ResponseEntity<MemberResponse> updateMemberName(
+            @PathVariable Long memberId,
+            @RequestBody String newName) {
+        MemberResponse updatedMember = memberService.updateMemberName(memberId, newName);
+        return ResponseEntity.ok(updatedMember);
+    }
 }
diff --git a/src/main/java/doit/apihw/api/controller/dto/AuthLoginResponse.java b/src/main/java/doit/apihw/api/controller/dto/AuthLoginResponse.java
index 537edad..d57f03c 100644
--- a/src/main/java/doit/apihw/api/controller/dto/AuthLoginResponse.java
+++ b/src/main/java/doit/apihw/api/controller/dto/AuthLoginResponse.java
@@ -16,4 +16,4 @@ public static AuthLoginResponse from(Member member) {
                 .memberName(member.getMemberName())
                 .build();
     }
-}
+}
\ No newline at end of file
diff --git a/src/main/java/doit/apihw/api/service/AuthService.java b/src/main/java/doit/apihw/api/service/AuthService.java
index ca3dd9d..384002c 100644
--- a/src/main/java/doit/apihw/api/service/AuthService.java
+++ b/src/main/java/doit/apihw/api/service/AuthService.java
@@ -9,6 +9,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.RestController;
 
+
 @RestController
 @RequiredArgsConstructor
 public class AuthService {
@@ -52,11 +53,16 @@ public AuthLoginResponse signUp(AuthSignUpRequest request) {
     // TODO : 로그인을 진행한다.
     public AuthLoginResponse login(AuthLoginRequest request) {
         // DB에서 memberLoginId와 memberPassword를 조회하여 일치하는 회원이 있는지 확인한다.
+        Member member = memberRepository.findByMemberLoginIdAndMemberPassword(
+                request.getMemberLoginId(), request.getMemberPassword());
 
         // 만약 일치하는 회원이 없다면, IllegalArgumentException을 발생시킨다.
+        if (member == null) {
+            throw new IllegalArgumentException("아이디 또는 비밀번호가 일치하지 않습니다.");
+        }
 
-        // 일치하는 회원이 있다면, MemberResponse로 변환하여 반환한다.
-        return null;
+        // 일치하는 회원이 있다면, AuthLoginResponse로 변환하여 반환한다.
+        return AuthLoginResponse.from(member);
     }
 
 
diff --git a/src/main/java/doit/apihw/api/service/MemberService.java b/src/main/java/doit/apihw/api/service/MemberService.java
index dc31790..23f1165 100644
--- a/src/main/java/doit/apihw/api/service/MemberService.java
+++ b/src/main/java/doit/apihw/api/service/MemberService.java
@@ -7,6 +7,7 @@
 import java.time.LocalDate;
 import java.util.List;
 import java.util.Optional;
+import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
@@ -31,26 +32,41 @@ public MemberResponse findOneMember(Long memberId) {
     // TODO : 전체 회원 정보를 조회한다.
     public List<MemberResponse> findAllMembers() {
         // DB에서 전체 회원 정보를 조회한다.
-
+        List<Member> members = memberRepository.findAll();
         // 조회된 회원 정보를 List<MemberResponse>로 변환하여 반환한다.
-        return null;
+        return members.stream()
+                .map(MemberResponse::from)
+                .collect(Collectors.toList());
     }
 
     // TODO : 회원 이름으로 회원 정보를 조회한다.
     public List<MemberResponse> searchMembersWithName(String memberName) {
         // DB에서 memberName에 해당하는 회원 정보를 조회한다.
-
+        List<Member> members = memberRepository.findByMemberNameContaining(memberName);
         // 조회된 회원 정보를 List<MemberResponse>로 변환하여 반환한다.
-        return null;
+        return members.stream()
+                .map(MemberResponse::from)
+                .toList();
     }
 
     // TODO : 회원 비밀번호를 변경한다.
     public void changePassword(Long memberId, AuthPasswordChangeRequest request) {
         // DB에서 memberId에 해당하는 회원 정보를 조회하고, 존재하지 않는다면 IllegalArgumentException을 발생시킨다.
-
+        Member member = memberRepository.findById(memberId)
+                .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 회원입니다."));
         // 조회된 회원 정보의 비밀번호를 변경한다. ( request.getNewPassword()를 이용하여 변경한다. )
-
+        member.changePassword(request.getOldPassword(), request.getNewPassword());
+        memberRepository.save(member);
         // 변경된 회원 정보를 DB에 저장한다.
     }
 
+    public MemberResponse updateMemberName(Long memberId, String newName) {
+        Member member = memberRepository.findById(memberId)
+                .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 회원입니다."));
+
+        member.updateName(newName);
+        Member updatedMember = memberRepository.save(member);
+        return MemberResponse.from(updatedMember);
+    }
+
 }
diff --git a/src/main/java/doit/apihw/domain/member/Member.java b/src/main/java/doit/apihw/domain/member/Member.java
index cb60b39..1da63f5 100644
--- a/src/main/java/doit/apihw/domain/member/Member.java
+++ b/src/main/java/doit/apihw/domain/member/Member.java
@@ -38,4 +38,11 @@ public void changePassword(String oldPassword, String newPassword) {
         }
         memberPassword = newPassword;
     }
+
+    public void updateName(String newName) {
+        if (newName == null || newName.trim().isEmpty()) {
+            throw new IllegalArgumentException("이름은 비어있을 수 없습니다.");
+        }
+        this.memberName = newName;
+    }
 }
diff --git a/src/main/java/doit/apihw/domain/member/MemberRepository.java b/src/main/java/doit/apihw/domain/member/MemberRepository.java
index a795758..30ef76c 100644
--- a/src/main/java/doit/apihw/domain/member/MemberRepository.java
+++ b/src/main/java/doit/apihw/domain/member/MemberRepository.java
@@ -1,11 +1,12 @@
 package doit.apihw.domain.member;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import java.util.List;
 
 public interface MemberRepository extends JpaRepository<Member, Long> {
     Member findByMemberLoginId(String memberLoginId);
     // TODO : 회원 이름으로 회원 정보를 조회한다.
-
+    List<Member> findByMemberNameContaining(String memberName);
     // TODO : 회원 로그인 ID와 비밀번호로 회원 정보를 조회한다.
-
+    Member findByMemberLoginIdAndMemberPassword(String memberLoginId, String memberPassword);
 }