diff --git a/src/main/java/clap/server/adapter/inbound/web/dto/notification/CountNotificationResponse.java b/src/main/java/clap/server/adapter/inbound/web/dto/notification/CountNotificationResponse.java
new file mode 100644
index 00000000..0c9eba0b
--- /dev/null
+++ b/src/main/java/clap/server/adapter/inbound/web/dto/notification/CountNotificationResponse.java
@@ -0,0 +1,7 @@
+package clap.server.adapter.inbound.web.dto.notification;
+
+public record CountNotificationResponse(
+        Long memberId,
+        Integer count
+) {
+}
diff --git a/src/main/java/clap/server/adapter/inbound/web/notification/FindNotificationController.java b/src/main/java/clap/server/adapter/inbound/web/notification/FindNotificationController.java
index 5dfc9b59..1feb38ed 100644
--- a/src/main/java/clap/server/adapter/inbound/web/notification/FindNotificationController.java
+++ b/src/main/java/clap/server/adapter/inbound/web/notification/FindNotificationController.java
@@ -2,7 +2,9 @@
 
 import clap.server.adapter.inbound.security.SecurityUserDetails;
 import clap.server.adapter.inbound.web.dto.common.SliceResponse;
+import clap.server.adapter.inbound.web.dto.notification.CountNotificationResponse;
 import clap.server.adapter.inbound.web.dto.notification.FindNotificationListResponse;
+import clap.server.application.port.inbound.notification.CountNotificationUseCase;
 import clap.server.application.port.inbound.notification.FindNotificationListUsecase;
 import clap.server.common.annotation.architecture.WebAdapter;
 import io.swagger.v3.oas.annotations.Operation;
@@ -27,6 +29,7 @@
 public class FindNotificationController {
 
     private final FindNotificationListUsecase findNotificationListUsecase;
+    private final CountNotificationUseCase countNotificationUseCase;
 
     @Operation(summary = "알림 목록 조회 API")
     @Parameters({
@@ -41,4 +44,11 @@ public ResponseEntity<SliceResponse<FindNotificationListResponse>> findNotificat
         Pageable pageable = PageRequest.of(page, size);
         return ResponseEntity.ok(findNotificationListUsecase.findNotificationList(securityUserDetails.getUserId(), pageable));
     }
+
+    @Operation(summary = "미확인 알림 개수 조회 API")
+    @GetMapping("/count")
+    public ResponseEntity<CountNotificationResponse> countNotification(
+            @AuthenticationPrincipal SecurityUserDetails userInfo) {
+        return ResponseEntity.ok(countNotificationUseCase.countNotification(userInfo.getUserId()));
+    }
 }
diff --git a/src/main/java/clap/server/adapter/outbound/persistense/NotificationPersistenceAdapter.java b/src/main/java/clap/server/adapter/outbound/persistense/NotificationPersistenceAdapter.java
index b7330bd0..6df83e81 100644
--- a/src/main/java/clap/server/adapter/outbound/persistense/NotificationPersistenceAdapter.java
+++ b/src/main/java/clap/server/adapter/outbound/persistense/NotificationPersistenceAdapter.java
@@ -49,6 +49,11 @@ public List<Notification> findNotificationsByMemberId(Long memberId) {
                 .collect(Collectors.toList());
     }
 
+    @Override
+    public Integer countNotification(Long memberId) {
+        return notificationRepository.countByIsReadFalseAndReceiver_MemberId(memberId);
+    }
+
     @Override
     public void save(Notification notification) {
         notificationRepository.save(notificationPersistenceMapper.toEntity(notification));
diff --git a/src/main/java/clap/server/adapter/outbound/persistense/repository/notification/NotificationRepository.java b/src/main/java/clap/server/adapter/outbound/persistense/repository/notification/NotificationRepository.java
index 0239cd44..e4462dd5 100644
--- a/src/main/java/clap/server/adapter/outbound/persistense/repository/notification/NotificationRepository.java
+++ b/src/main/java/clap/server/adapter/outbound/persistense/repository/notification/NotificationRepository.java
@@ -1,5 +1,6 @@
 package clap.server.adapter.outbound.persistense.repository.notification;
 
+import clap.server.adapter.outbound.persistense.entity.member.MemberEntity;
 import clap.server.adapter.outbound.persistense.entity.notification.NotificationEntity;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Slice;
@@ -15,4 +16,6 @@ public interface NotificationRepository extends JpaRepository<NotificationEntity
     Slice<NotificationEntity> findAllByReceiver_MemberIdOrderByCreatedAtDesc(Long receiverId, Pageable pageable);
 
     List<NotificationEntity> findAllByReceiver_MemberId(Long memberId);
+
+    Integer countByIsReadFalseAndReceiver_MemberId(Long memberId);
 }
\ No newline at end of file
diff --git a/src/main/java/clap/server/application/mapper/NotificationMapper.java b/src/main/java/clap/server/application/mapper/NotificationMapper.java
index e2c83e52..4098dd39 100644
--- a/src/main/java/clap/server/application/mapper/NotificationMapper.java
+++ b/src/main/java/clap/server/application/mapper/NotificationMapper.java
@@ -1,6 +1,7 @@
 package clap.server.application.mapper;
 
 import clap.server.adapter.inbound.web.dto.common.SliceResponse;
+import clap.server.adapter.inbound.web.dto.notification.CountNotificationResponse;
 import clap.server.adapter.inbound.web.dto.notification.FindNotificationListResponse;
 import clap.server.domain.model.notification.Notification;
 import org.springframework.data.domain.Slice;
@@ -28,4 +29,11 @@ public static SliceResponse<FindNotificationListResponse> toSliceOfFindNoticeLis
                 slice.isLast()
         );
     }
+
+    public static CountNotificationResponse toCountNotificationResponse(Long userId, Integer count) {
+        return new CountNotificationResponse(
+                userId,
+                count
+        );
+    }
 }
diff --git a/src/main/java/clap/server/application/port/inbound/notification/CountNotificationUseCase.java b/src/main/java/clap/server/application/port/inbound/notification/CountNotificationUseCase.java
new file mode 100644
index 00000000..f69158a6
--- /dev/null
+++ b/src/main/java/clap/server/application/port/inbound/notification/CountNotificationUseCase.java
@@ -0,0 +1,8 @@
+package clap.server.application.port.inbound.notification;
+
+import clap.server.adapter.inbound.web.dto.notification.CountNotificationResponse;
+
+public interface CountNotificationUseCase {
+
+    CountNotificationResponse countNotification(Long userId);
+}
diff --git a/src/main/java/clap/server/application/port/outbound/notification/LoadNotificationPort.java b/src/main/java/clap/server/application/port/outbound/notification/LoadNotificationPort.java
index 8954c40d..4e4a8731 100644
--- a/src/main/java/clap/server/application/port/outbound/notification/LoadNotificationPort.java
+++ b/src/main/java/clap/server/application/port/outbound/notification/LoadNotificationPort.java
@@ -15,4 +15,6 @@ public interface LoadNotificationPort {
     SliceResponse<FindNotificationListResponse> findAllByReceiverId(Long receiverId, Pageable pageable);
 
     List<Notification> findNotificationsByMemberId(Long memberId);
+
+    Integer countNotification(Long memberId);
 }
\ No newline at end of file
diff --git a/src/main/java/clap/server/application/service/notification/CountNotificationService.java b/src/main/java/clap/server/application/service/notification/CountNotificationService.java
new file mode 100644
index 00000000..325688bc
--- /dev/null
+++ b/src/main/java/clap/server/application/service/notification/CountNotificationService.java
@@ -0,0 +1,25 @@
+package clap.server.application.service.notification;
+
+import clap.server.adapter.inbound.web.dto.notification.CountNotificationResponse;
+import clap.server.application.mapper.NotificationMapper;
+import clap.server.application.port.inbound.notification.CountNotificationUseCase;
+import clap.server.application.port.outbound.notification.LoadNotificationPort;
+import clap.server.common.annotation.architecture.ApplicationService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.transaction.annotation.Transactional;
+
+@ApplicationService
+@Transactional(readOnly = true)
+@RequiredArgsConstructor
+public class CountNotificationService implements CountNotificationUseCase {
+
+    private final LoadNotificationPort loadNotificationPort;
+
+    @Transactional
+    @Override
+    public CountNotificationResponse countNotification(Long userId) {
+        Integer count = loadNotificationPort.countNotification(userId);
+
+        return NotificationMapper.toCountNotificationResponse(userId, count);
+    }
+}
diff --git a/src/main/java/clap/server/application/service/notification/CreateNotificationService.java b/src/main/java/clap/server/application/service/notification/CreateNotificationService.java
index 8071eba1..a99af8bc 100644
--- a/src/main/java/clap/server/application/service/notification/CreateNotificationService.java
+++ b/src/main/java/clap/server/application/service/notification/CreateNotificationService.java
@@ -4,6 +4,7 @@
 import clap.server.common.annotation.architecture.ApplicationService;
 import clap.server.domain.model.notification.Notification;
 import lombok.RequiredArgsConstructor;
+import org.springframework.transaction.annotation.Transactional;
 
 @ApplicationService
 @RequiredArgsConstructor
@@ -11,6 +12,7 @@ public class CreateNotificationService{
 
     private final CommandNotificationPort commandNotificationPort;
 
+    @Transactional
     public void createNotification(Notification request) {
 
         commandNotificationPort.save(request);