diff --git a/frontend/src/components/DropdownSelect.vue b/frontend/src/components/DropdownSelect.vue
index 06eead0..868d738 100644
--- a/frontend/src/components/DropdownSelect.vue
+++ b/frontend/src/components/DropdownSelect.vue
@@ -1,7 +1,8 @@
 <script setup lang="ts" generic="T extends string">
 // 커스텀 드롭다운(셀렉트) — 네이티브 select 대신 디자인 토큰에 맞춘 정렬/필터 공통 UI.
 // 메뉴는 body 로 Teleport + fixed 위치로 띄워, 스크롤/overflow 컨테이너 안에서도 잘리지 않는다.
-import { computed, nextTick, onBeforeUnmount, onMounted, ref } from 'vue'
+import { computed, nextTick, ref } from 'vue'
+import { useClickOutside } from '@/composables/useClickOutside'
 
 interface Option {
   value: T
@@ -61,31 +62,11 @@ function select(value: T): void {
   open.value = false
 }
 
-// 바깥 클릭(트리거/메뉴 외부) / Esc 로 닫기
-function onDocClick(e: MouseEvent): void {
-  if (!open.value) return
-  const t = e.target as Node
-  if (root.value?.contains(t) || menuRef.value?.contains(t)) return
-  open.value = false
-}
-function onKeydown(e: KeyboardEvent): void {
-  if (open.value && e.key === 'Escape') open.value = false
-}
-// 스크롤/리사이즈 시 위치가 어긋나므로 닫는다(간단·안전)
-function onReposition(): void {
-  if (open.value) open.value = false
-}
-onMounted(() => {
-  document.addEventListener('click', onDocClick)
-  document.addEventListener('keydown', onKeydown)
-  window.addEventListener('scroll', onReposition, true)
-  window.addEventListener('resize', onReposition)
-})
-onBeforeUnmount(() => {
-  document.removeEventListener('click', onDocClick)
-  document.removeEventListener('keydown', onKeydown)
-  window.removeEventListener('scroll', onReposition, true)
-  window.removeEventListener('resize', onReposition)
+// 바깥 클릭(트리거/메뉴 외부)·Esc·스크롤(위치 어긋남) 시 닫기 — 공용 훅
+useClickOutside(open, () => (open.value = false), [root, menuRef], {
+  event: 'click',
+  esc: true,
+  closeOnScroll: true,
 })
 </script>
 
diff --git a/frontend/src/components/StatusSelect.vue b/frontend/src/components/StatusSelect.vue
index 99e7311..633ac1f 100644
--- a/frontend/src/components/StatusSelect.vue
+++ b/frontend/src/components/StatusSelect.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 // 진행 상태(대기/진행 중/완료) 선택 드롭다운 — 상태색 테마. 메뉴는 body Teleport(스크롤 클리핑 방지).
-import { computed, nextTick, onBeforeUnmount, onMounted, ref } from 'vue'
+import { computed, nextTick, ref } from 'vue'
+import { useClickOutside } from '@/composables/useClickOutside'
 import type { ChecklistWorkStatus } from '@/mock/relay.mock'
 
 const props = defineProps<{ modelValue: ChecklistWorkStatus }>()
@@ -36,24 +37,11 @@ function pick(v: ChecklistWorkStatus): void {
   emit('update:modelValue', v)
   open.value = false
 }
-function onDoc(e: MouseEvent): void {
-  if (!open.value) return
-  const t = e.target as Node
-  if (triggerRef.value?.contains(t) || menuRef.value?.contains(t)) return
-  open.value = false
-}
-function onReposition(): void {
-  if (open.value) open.value = false
-}
-onMounted(() => {
-  document.addEventListener('click', onDoc)
-  window.addEventListener('scroll', onReposition, true)
-  window.addEventListener('resize', onReposition)
-})
-onBeforeUnmount(() => {
-  document.removeEventListener('click', onDoc)
-  window.removeEventListener('scroll', onReposition, true)
-  window.removeEventListener('resize', onReposition)
+// 바깥 클릭·스크롤(위치 어긋남) 시 닫기 — 공용 훅(Teleport 메뉴라 트리거+메뉴 모두 내부로)
+useClickOutside(open, () => (open.value = false), [triggerRef, menuRef], {
+  event: 'click',
+  esc: false,
+  closeOnScroll: true,
 })
 </script>
 
diff --git a/frontend/src/components/schedule/ScheduleDetailPanel.vue b/frontend/src/components/schedule/ScheduleDetailPanel.vue
index 400b433..e79faf0 100644
--- a/frontend/src/components/schedule/ScheduleDetailPanel.vue
+++ b/frontend/src/components/schedule/ScheduleDetailPanel.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 // 우측 슬라이드 상세 패널 — 선택 일정의 시간/장소/참석자/메모 + 수정·삭제
-import { computed, ref, watch, onBeforeUnmount } from 'vue'
+import { computed, ref, watch } from 'vue'
+import { useClickOutside } from '@/composables/useClickOutside'
 import ScheduleAvatar from './ScheduleAvatar.vue'
 import { eventDateText, spanDays } from '@/shared/utils/scheduleDate'
 import type { ApiScheduleCategory, ApiScheduleEvent } from '@/types/schedule'
@@ -36,15 +37,7 @@ const dur = computed(() =>
 // 참석자 스택 토글
 const attOpen = ref(false)
 const attRef = ref<HTMLElement | null>(null)
-function onDoc(e: MouseEvent): void {
-  if (!attOpen.value) return
-  if (attRef.value && !attRef.value.contains(e.target as Node)) attOpen.value = false
-}
-watch(attOpen, (v) => {
-  if (v) document.addEventListener('mousedown', onDoc)
-  else document.removeEventListener('mousedown', onDoc)
-})
-onBeforeUnmount(() => document.removeEventListener('mousedown', onDoc))
+useClickOutside(attOpen, () => (attOpen.value = false), [attRef], { esc: false })
 
 const MAX = 6
 const attendees = computed(() => ev.value?.attendees ?? [])
diff --git a/frontend/src/components/schedule/ScheduleEventModal.vue b/frontend/src/components/schedule/ScheduleEventModal.vue
index 970945e..d7f7463 100644
--- a/frontend/src/components/schedule/ScheduleEventModal.vue
+++ b/frontend/src/components/schedule/ScheduleEventModal.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 // 일정 생성/수정 모달
 import { computed, onBeforeUnmount, onMounted, ref, watch } from 'vue'
+import { useClickOutside } from '@/composables/useClickOutside'
 import ScheduleAvatar from './ScheduleAvatar.vue'
 import type {
   ApiScheduleCategory,
@@ -90,22 +91,15 @@ function togglePerson(id: string): void {
     ? attendeeIds.value.filter((x) => x !== id)
     : [...attendeeIds.value, id]
 }
-function onDoc(ev: MouseEvent): void {
-  if (msRef.value && !msRef.value.contains(ev.target as Node)) msOpen.value = false
-}
-watch(msOpen, (v) => {
-  if (v) document.addEventListener('mousedown', onDoc)
-  else document.removeEventListener('mousedown', onDoc)
-})
+// 참석자 멀티셀렉트 바깥클릭 닫기(ESC 는 모달 닫기에서 처리하므로 제외)
+useClickOutside(msOpen, () => (msOpen.value = false), [msRef], { esc: false })
 
+// 모달 ESC = 닫기
 function onKey(ev: KeyboardEvent): void {
   if (ev.key === 'Escape') emit('close')
 }
 onMounted(() => document.addEventListener('keydown', onKey))
-onBeforeUnmount(() => {
-  document.removeEventListener('keydown', onKey)
-  document.removeEventListener('mousedown', onDoc)
-})
+onBeforeUnmount(() => document.removeEventListener('keydown', onKey))
 
 function submit(): void {
   if (!valid.value) return
diff --git a/frontend/src/components/schedule/ScheduleTypeFilter.vue b/frontend/src/components/schedule/ScheduleTypeFilter.vue
index 1930b78..d7da7a5 100644
--- a/frontend/src/components/schedule/ScheduleTypeFilter.vue
+++ b/frontend/src/components/schedule/ScheduleTypeFilter.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 // 유형 필터 + 카테고리 관리 드롭다운
-import { computed, ref, watch, onBeforeUnmount } from 'vue'
+import { computed, ref } from 'vue'
+import { useClickOutside } from '@/composables/useClickOutside'
 import type { ApiScheduleCategory } from '@/types/schedule'
 
 const props = defineProps<{
@@ -18,14 +19,7 @@ const emit = defineEmits<{
 
 const open = ref(false)
 const rootRef = ref<HTMLElement | null>(null)
-function onDoc(e: MouseEvent): void {
-  if (rootRef.value && !rootRef.value.contains(e.target as Node)) open.value = false
-}
-watch(open, (v) => {
-  if (v) document.addEventListener('mousedown', onDoc)
-  else document.removeEventListener('mousedown', onDoc)
-})
-onBeforeUnmount(() => document.removeEventListener('mousedown', onDoc))
+useClickOutside(open, () => (open.value = false), [rootRef], { esc: false })
 
 const ordered = computed(() =>
   [...props.categories].sort((a, b) => a.sortOrder - b.sortOrder),
diff --git a/frontend/src/composables/useClickOutside.ts b/frontend/src/composables/useClickOutside.ts
new file mode 100644
index 0000000..fb9413f
--- /dev/null
+++ b/frontend/src/composables/useClickOutside.ts
@@ -0,0 +1,54 @@
+import { onBeforeUnmount, onMounted, type Ref } from 'vue'
+
+// 바깥 클릭 / ESC / 스크롤 시 닫기 공용 훅.
+// 드롭다운·팝오버·메뉴 등에서 반복되던 document 리스너 등록/해제 로직을 한 곳으로 모은다.
+//
+// - isOpen:    열림 상태 ref (닫혀 있으면 아무 동작 안 함)
+// - close:     닫기 콜백
+// - containers: "내부"로 간주할 엘리먼트 ref 목록. 클릭이 이 안이면 무시한다
+//               (Teleport 로 body 에 띄운 메뉴는 트리거와 메뉴 ref 를 모두 넣는다)
+// - opts.event:        바깥 클릭 감지 이벤트 (기본 'mousedown')
+// - opts.esc:          Escape 로 닫을지 (기본 true)
+// - opts.closeOnScroll: 스크롤/리사이즈 시 닫을지 — fixed 로 띄운 메뉴 위치 어긋남 방지 (기본 false)
+export function useClickOutside(
+  isOpen: Ref<boolean>,
+  close: () => void,
+  containers: Ref<HTMLElement | null>[],
+  opts: {
+    event?: 'mousedown' | 'click'
+    esc?: boolean
+    closeOnScroll?: boolean
+  } = {},
+): void {
+  const { event = 'mousedown', esc = true, closeOnScroll = false } = opts
+
+  function onPointer(e: Event): void {
+    if (!isOpen.value) return
+    const t = e.target as Node
+    if (containers.some((r) => r.value?.contains(t))) return
+    close()
+  }
+  function onKey(e: KeyboardEvent): void {
+    if (isOpen.value && e.key === 'Escape') close()
+  }
+  function onScroll(): void {
+    if (isOpen.value) close()
+  }
+
+  onMounted(() => {
+    document.addEventListener(event, onPointer, true)
+    if (esc) document.addEventListener('keydown', onKey)
+    if (closeOnScroll) {
+      window.addEventListener('scroll', onScroll, true)
+      window.addEventListener('resize', onScroll)
+    }
+  })
+  onBeforeUnmount(() => {
+    document.removeEventListener(event, onPointer, true)
+    if (esc) document.removeEventListener('keydown', onKey)
+    if (closeOnScroll) {
+      window.removeEventListener('scroll', onScroll, true)
+      window.removeEventListener('resize', onScroll)
+    }
+  })
+}