diff --git a/src/main/java/shop/fevertime/backend/api/UserApiController.java b/src/main/java/shop/fevertime/backend/api/UserApiController.java
index d9ef223..69b2159 100644
--- a/src/main/java/shop/fevertime/backend/api/UserApiController.java
+++ b/src/main/java/shop/fevertime/backend/api/UserApiController.java
@@ -87,4 +87,12 @@ public ResultResponseDto updateUsername(@ModelAttribute UserRequestDto requestDt
     public List<UserChallengeResponseDto> getChallengesByUser(@AuthenticationPrincipal UserDetailsImpl userDetails) {
         return challengeHistoryService.getChallengesByUser(userDetails.getUser());
     }
+
+    /**
+     * 유저 카카오 아이디로 정보 조회 API
+     */
+    @GetMapping("/user/{kakaoId}")
+    public UserResponseDto getChatUser(@PathVariable String kakaoId) {
+        return userService.getChatUser(kakaoId);
+    }
 }
diff --git a/src/main/java/shop/fevertime/backend/dto/ChatMessageDto.java b/src/main/java/shop/fevertime/backend/dto/ChatMessageDto.java
index 1b204d0..b3fab72 100644
--- a/src/main/java/shop/fevertime/backend/dto/ChatMessageDto.java
+++ b/src/main/java/shop/fevertime/backend/dto/ChatMessageDto.java
@@ -7,5 +7,6 @@
 @Setter
 public class ChatMessageDto {
     private String roomId;
+    private String sender;
     private String message;
 }
diff --git a/src/main/java/shop/fevertime/backend/dto/response/ChatRoomResponseDto.java b/src/main/java/shop/fevertime/backend/dto/response/ChatRoomResponseDto.java
index 7751425..e0ba15d 100644
--- a/src/main/java/shop/fevertime/backend/dto/response/ChatRoomResponseDto.java
+++ b/src/main/java/shop/fevertime/backend/dto/response/ChatRoomResponseDto.java
@@ -14,11 +14,13 @@ public class ChatRoomResponseDto {
     private Long roomId;
     private String name;
     private String createdDate;
+    private String creator;
 
     public ChatRoomResponseDto(ChatRoom chatRoom) {
         this.roomId = chatRoom.getId();
         this.name= chatRoom.getName();
-        this.createdDate = chatRoom.getCreatedDate().format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));;
+        this.createdDate = chatRoom.getCreatedDate().format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
+        this.creator = chatRoom.getUser().getKakaoId();
     }
 
 }
diff --git a/src/main/java/shop/fevertime/backend/service/UserService.java b/src/main/java/shop/fevertime/backend/service/UserService.java
index 39851d7..6b9e6ca 100644
--- a/src/main/java/shop/fevertime/backend/service/UserService.java
+++ b/src/main/java/shop/fevertime/backend/service/UserService.java
@@ -9,6 +9,7 @@
 
 import shop.fevertime.backend.dto.response.FeedResponseDto;
 import shop.fevertime.backend.dto.response.UserChallengeResponseDto;
+import shop.fevertime.backend.dto.response.UserResponseDto;
 import shop.fevertime.backend.exception.ApiRequestException;
 import shop.fevertime.backend.repository.ChallengeHistoryRepository;
 import shop.fevertime.backend.repository.ChallengeRepository;
@@ -93,4 +94,14 @@ public void updateUsername(User user, UserRequestDto requestDto) {
 
         findUser.updateUsername(requestDto.getUsername());
     }
+
+    //카카오 아이디로 유저 정보 가져오기
+    @Transactional
+    public UserResponseDto getChatUser(String kakaoId) {
+        User findUser = userRepository.findByKakaoId(kakaoId).orElseThrow(
+                () -> new ApiRequestException("해당 아이디가 존재하지 않습니다.")
+        );
+        return new UserResponseDto(findUser);
+    }
+
 }