diff --git a/backend/src/modules/project/project-member.service.ts b/backend/src/modules/project/project-member.service.ts
index be780e6..26901f2 100644
--- a/backend/src/modules/project/project-member.service.ts
+++ b/backend/src/modules/project/project-member.service.ts
@@ -120,7 +120,11 @@ export class ProjectMemberService {
       recipientIds: [user.id],
       actorId: actingUserId,
       type: 'member.invited',
-      payload: { projectId: project.id, projectName: project.name },
+      payload: {
+        projectId: project.id,
+        projectName: project.name,
+        actorName: await this.actorName(actingUserId),
+      },
     });
     return this.toResponse(saved);
   }
@@ -160,6 +164,7 @@ export class ProjectMemberService {
         projectId: project.id,
         projectName: project.name,
         roleType: member.roleType,
+        actorName: await this.actorName(actingUserId),
       },
     });
     return this.toResponse(member);
@@ -194,7 +199,11 @@ export class ProjectMemberService {
       recipientIds: [targetUserId],
       actorId: actingUserId,
       type: 'member.removed',
-      payload: { projectId: project.id, projectName: project.name },
+      payload: {
+        projectId: project.id,
+        projectName: project.name,
+        actorName: await this.actorName(actingUserId),
+      },
     });
   }
 
@@ -227,6 +236,12 @@ export class ProjectMemberService {
     return project;
   }
 
+  // 행위자 표시 이름 — 알림 payload 의 actorName 용. 없으면 '' (프론트가 '누군가'로 폴백)
+  private async actorName(userId: string): Promise<string> {
+    const user = await this.userService.findById(userId);
+    return user?.name ?? '';
+  }
+
   private async getMemberOrThrow(
     projectId: string,
     userId: string,