diff --git a/backend/src/modules/activity/activity.controller.ts b/backend/src/modules/activity/activity.controller.ts
index dace81c..7fb0516 100644
--- a/backend/src/modules/activity/activity.controller.ts
+++ b/backend/src/modules/activity/activity.controller.ts
@@ -1,11 +1,15 @@
 import {
   Controller,
+  DefaultValuePipe,
   Get,
   Param,
+  ParseIntPipe,
   ParseUUIDPipe,
+  Query,
   UseGuards,
 } from '@nestjs/common';
 import { ApiOperation, ApiResponse, ApiTags } from '@nestjs/swagger';
+import type { PaginatedResult } from '../../common/pagination/pagination';
 import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 import { ActivityService, type ActivityResponse } from './activity.service';
 
@@ -17,11 +21,13 @@ export class ActivityController {
   constructor(private readonly activityService: ActivityService) {}
 
   @Get()
-  @ApiOperation({ summary: '프로젝트 활동 피드 (최신순)' })
+  @ApiOperation({ summary: '프로젝트 활동 피드 (최신순, 페이지네이션)' })
   @ApiResponse({ status: 200, description: '조회 성공' })
   list(
     @Param('projectId', ParseUUIDPipe) projectId: string,
-  ): Promise<ActivityResponse[]> {
-    return this.activityService.listForProject(projectId);
+    @Query('page', new DefaultValuePipe(1), ParseIntPipe) page: number,
+    @Query('size', new DefaultValuePipe(20), ParseIntPipe) size: number,
+  ): Promise<PaginatedResult<ActivityResponse>> {
+    return this.activityService.listForProject(projectId, page, size);
   }
 }
diff --git a/backend/src/modules/activity/activity.service.ts b/backend/src/modules/activity/activity.service.ts
index c9b720c..908c489 100644
--- a/backend/src/modules/activity/activity.service.ts
+++ b/backend/src/modules/activity/activity.service.ts
@@ -1,10 +1,18 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
+import {
+  paginated,
+  resolvePage,
+  type PaginatedResult,
+} from '../../common/pagination/pagination';
 import { UserService, type PublicUser } from '../user/user.service';
 import { Project } from '../project/entities/project.entity';
 import { Activity, type ActivityType } from './entities/activity.entity';
 
+// 업무 상세 활동 탭 조회 상한 — 매우 활발한 업무에서 전량 렌더링을 방지(최신 N건)
+const TASK_ACTIVITY_LIMIT = 100;
+
 // 활동 응답(원시) — 표시 문구/아이콘/톤은 프론트가 type+payload 로 조립
 export interface ActivityResponse {
   id: string;
@@ -54,18 +62,29 @@ export class ActivityService {
     }
   }
 
-  // 프로젝트 활동 피드 — projectId(uuid)로 조회(최신순, 최대 200건). 날짜 그룹핑은 프론트.
-  async listForProject(projectId: string): Promise<ActivityResponse[]> {
-    const rows = await this.activityRepo.find({
+  // 프로젝트 활동 피드 — projectId(uuid)로 조회(최신순, 오프셋 페이지네이션). 날짜 그룹핑은 프론트.
+  async listForProject(
+    projectId: string,
+    page?: number,
+    size?: number,
+  ): Promise<PaginatedResult<ActivityResponse>> {
+    const pg = resolvePage(page, size);
+    const [rows, total] = await this.activityRepo.findAndCount({
       where: { project: { id: projectId } },
       relations: ['actor'],
       order: { createdAt: 'DESC' },
-      take: 200,
+      skip: pg.skip,
+      take: pg.take,
     });
-    return rows.map((a) => this.toResponse(a));
+    return paginated(
+      rows.map((a) => this.toResponse(a)),
+      total,
+      pg,
+    );
   }
 
   // 업무 활동 — projectId(uuid) + 업무 순번(seq) 기준(최신순). 업무 상세 활동 탭용.
+  // 전량 렌더링 방지를 위해 최신 TASK_ACTIVITY_LIMIT 건으로 제한한다.
   async listForTask(
     projectId: string,
     taskSeq: number,
@@ -74,6 +93,7 @@ export class ActivityService {
       where: { project: { id: projectId }, taskSeq },
       relations: ['actor'],
       order: { createdAt: 'DESC' },
+      take: TASK_ACTIVITY_LIMIT,
     });
     return rows.map((a) => this.toResponse(a));
   }
diff --git a/frontend/src/composables/useActivity.ts b/frontend/src/composables/useActivity.ts
index 2d54c42..c7e5097 100644
--- a/frontend/src/composables/useActivity.ts
+++ b/frontend/src/composables/useActivity.ts
@@ -1,13 +1,20 @@
 import { useApi } from './useApi'
+import { DEFAULT_PAGE_SIZE, type Paginated } from '@/types/pagination'
 import type { ApiActivity } from '@/types/activity'
 
 // 활동 피드 API Composable — 인터셉터가 success/data 를 언래핑
 export function useActivity() {
   const api = useApi()
 
-  // 프로젝트 활동 피드(최신순)
-  async function list(projectId: string): Promise<ApiActivity[]> {
-    return (await api.get(`/projects/${projectId}/activity`)) as unknown as ApiActivity[]
+  // 프로젝트 활동 피드(최신순, 페이지네이션)
+  async function list(
+    projectId: string,
+    page = 1,
+    size = DEFAULT_PAGE_SIZE,
+  ): Promise<Paginated<ApiActivity>> {
+    return (await api.get(`/projects/${projectId}/activity`, {
+      params: { page, size },
+    })) as unknown as Paginated<ApiActivity>
   }
 
   return { list }
diff --git a/frontend/src/pages/relay/ProjectActivityPage.vue b/frontend/src/pages/relay/ProjectActivityPage.vue
index 8a7b099..38a053b 100644
--- a/frontend/src/pages/relay/ProjectActivityPage.vue
+++ b/frontend/src/pages/relay/ProjectActivityPage.vue
@@ -242,6 +242,21 @@ const ActIcon = defineComponent({
           </template>
         </div>
       </div>
+
+      <!-- 더 보기 — 서버 페이지네이션(누적). 필터와 무관하게 다음 페이지를 불러온다 -->
+      <div
+        v-if="!loading && activityStore.hasMore"
+        class="more-row"
+      >
+        <button
+          type="button"
+          class="more-btn"
+          :disabled="activityStore.loadingMore"
+          @click="activityStore.loadMore()"
+        >
+          {{ activityStore.loadingMore ? '불러오는 중…' : '더 보기' }}
+        </button>
+      </div>
     </div>
   </AppShell>
 </template>
@@ -373,6 +388,30 @@ const ActIcon = defineComponent({
   margin-left: 0.75rem;
 }
 
+/* 더 보기 */
+.more-row {
+  display: flex;
+  justify-content: center;
+  margin-top: 0.875rem;
+}
+.more-btn {
+  border: 1px solid var(--border);
+  background: var(--panel);
+  border-radius: 0.5rem;
+  padding: 0.5rem 1.25rem;
+  font-size: 0.813rem;
+  font-weight: 600;
+  color: var(--text-2);
+  cursor: pointer;
+}
+.more-btn:hover:not(:disabled) {
+  background: #f4f5f7;
+}
+.more-btn:disabled {
+  opacity: 0.6;
+  cursor: default;
+}
+
 /* 로딩/빈 상태 */
 .feed-state {
   background: var(--panel);
diff --git a/frontend/src/stores/activity.store.ts b/frontend/src/stores/activity.store.ts
index 6b0cf44..4f98f81 100644
--- a/frontend/src/stores/activity.store.ts
+++ b/frontend/src/stores/activity.store.ts
@@ -1,6 +1,7 @@
-import { ref } from 'vue'
+import { computed, ref } from 'vue'
 import { defineStore } from 'pinia'
 import { useActivity } from '@/composables/useActivity'
+import { DEFAULT_PAGE_SIZE } from '@/types/pagination'
 import {
   dayGroupKo,
   escapeHtml,
@@ -116,33 +117,68 @@ function toProjectActivityItem(api: ApiActivity): ProjectActivityItem {
   }
 }
 
-// 활동 스토어 — 프로젝트 활동 피드(날짜 그룹)
+// 활동 스토어 — 프로젝트 활동 피드(페이지네이션 누적 → 날짜 그룹)
 export const useActivityStore = defineStore('activity', () => {
-  const days = ref<ProjectActivityDay[]>([])
+  const items = ref<ApiActivity[]>([])
+  const total = ref(0)
+  const page = ref(0)
+  const currentProjectId = ref<string | null>(null)
   const loading = ref(false)
+  const loadingMore = ref(false)
 
   const activityApi = useActivity()
 
-  // 프로젝트 활동 조회 → 날짜 그룹으로 묶기(목록은 최신순이라 같은 날은 연속)
+  // 더 불러올 페이지가 남았는지(누적 건수 < 전체)
+  const hasMore = computed(() => items.value.length < total.value)
+
+  // 누적 items → 날짜 그룹(최신순이라 같은 날은 연속)
+  const days = computed<ProjectActivityDay[]>(() => {
+    const groups: ProjectActivityDay[] = []
+    let current: ProjectActivityDay | null = null
+    for (const a of items.value) {
+      const day = dayGroupKo(a.createdAt)
+      if (!current || current.day !== day) {
+        current = { day, items: [] }
+        groups.push(current)
+      }
+      current.items.push(toProjectActivityItem(a))
+    }
+    return groups
+  })
+
+  // 첫 페이지(리셋) 로드
   async function fetch(projectId: string): Promise<void> {
     loading.value = true
+    currentProjectId.value = projectId
     try {
-      const list = await activityApi.list(projectId)
-      const groups: ProjectActivityDay[] = []
-      let current: ProjectActivityDay | null = null
-      for (const a of list) {
-        const day = dayGroupKo(a.createdAt)
-        if (!current || current.day !== day) {
-          current = { day, items: [] }
-          groups.push(current)
-        }
-        current.items.push(toProjectActivityItem(a))
-      }
-      days.value = groups
+      const res = await activityApi.list(projectId, 1, DEFAULT_PAGE_SIZE)
+      items.value = res.items
+      total.value = res.total
+      page.value = 1
     } finally {
       loading.value = false
     }
   }
 
-  return { days, loading, fetch }
+  // 다음 페이지 이어붙이기(더보기)
+  async function loadMore(): Promise<void> {
+    if (loadingMore.value || !hasMore.value || !currentProjectId.value) return
+    loadingMore.value = true
+    try {
+      const res = await activityApi.list(
+        currentProjectId.value,
+        page.value + 1,
+        DEFAULT_PAGE_SIZE,
+      )
+      // 그 사이 신규 적재로 중복될 수 있는 id 는 제외하고 append
+      const known = new Set(items.value.map((x) => x.id))
+      items.value.push(...res.items.filter((a) => !known.has(a.id)))
+      total.value = res.total
+      page.value += 1
+    } finally {
+      loadingMore.value = false
+    }
+  }
+
+  return { days, loading, loadingMore, hasMore, fetch, loadMore }
 })