diff --git a/frontend/src/views/Settings.vue b/frontend/src/views/Settings.vue
index 1c67323..756fa1b 100644
--- a/frontend/src/views/Settings.vue
+++ b/frontend/src/views/Settings.vue
@@ -421,16 +421,35 @@
               />
 
               <div class="user-search-toolbar">
-                <a-input-search
-                  v-model:value="userManagementSearchKeyword"
-                  allow-clear
-                  placeholder="搜索姓名、用户名、手机号、邮箱、部门"
-                  style="width: 320px"
-                >
-                  <template #prefix>
-                    <Icon name="search" size="sm" />
-                  </template>
-                </a-input-search>
+                <div class="user-search-filters">
+                  <a-input-search
+                    v-model:value="userManagementSearchKeyword"
+                    allow-clear
+                    placeholder="搜索姓名、用户名、手机号、邮箱、部门"
+                    style="width: 320px"
+                  >
+                    <template #prefix>
+                      <Icon name="search" size="sm" />
+                    </template>
+                  </a-input-search>
+                  <a-select
+                    v-model:value="userManagementDeptFilter"
+                    allow-clear
+                    show-search
+                    placeholder="按部门筛选"
+                    style="width: 220px"
+                    :filter-option="filterUserDepartmentOption"
+                  >
+                    <a-select-option value="unassigned">未分配部门</a-select-option>
+                    <a-select-option
+                      v-for="dept in userManagementDepartmentOptions"
+                      :key="dept.id"
+                      :value="dept.id"
+                    >
+                      {{ dept.deptName }}
+                    </a-select-option>
+                  </a-select>
+                </div>
                 <span class="user-search-count">
                   共 {{ filteredUsersList.length }} 位用户
                 </span>
@@ -3419,6 +3438,7 @@ const selectedUser = ref<User | null>(null)
 const transferDeptId = ref<number | null>(null)
 const allUsers = ref<User[]>([])
 const userManagementSearchKeyword = ref('')
+const userManagementDeptFilter = ref<number | string>()
 const offboardingPreviewLoading = ref(false)
 const offboardingExecuting = ref(false)
 const offboardingPreview = ref<UserOffboardingPreview | null>(null)
@@ -3815,26 +3835,51 @@ const allUsersList = computed(() => {
 
 const filteredUsersList = computed(() => {
   const keyword = userManagementSearchKeyword.value.trim().toLowerCase()
-  if (!keyword) {
-    return allUsersList.value
-  }
+  const deptFilter = userManagementDeptFilter.value
 
   return allUsersList.value.filter((user) => {
-    const searchFields = [
+    const matchesKeyword = !keyword || [
       user.id,
       user.realName,
       user.username,
       user.phone,
       user.email,
       user.deptName
-    ]
+    ].some((field) => String(field || '').toLowerCase().includes(keyword))
 
-    return searchFields.some((field) =>
-      String(field || '').toLowerCase().includes(keyword)
-    )
+    const matchesDept = !deptFilter
+      || (deptFilter === 'unassigned'
+        ? !user.deptId
+        : user.deptId === deptFilter)
+
+    return matchesKeyword && matchesDept
   })
 })
 
+const userManagementDepartmentOptions = computed(() => {
+  const seenDeptIds = new Set<number>()
+  const options: Array<{ id: number; deptName: string }> = []
+
+  allUsersList.value.forEach((user) => {
+    if (!user.deptId || !user.deptName || seenDeptIds.has(user.deptId)) {
+      return
+    }
+    seenDeptIds.add(user.deptId)
+    options.push({
+      id: user.deptId,
+      deptName: user.deptName
+    })
+  })
+
+  return options.sort((a, b) => a.deptName.localeCompare(b.deptName))
+})
+
+const filterUserDepartmentOption = (input: string, option: any) => {
+  const searchText = input.toLowerCase()
+  const optionLabel = String(option?.children || '').toLowerCase()
+  return optionLabel.includes(searchText)
+}
+
 // 格式化时间
 const formatUserTime = (time: string | undefined) => {
   if (!time) return '--'
@@ -6931,6 +6976,13 @@ watch(activeTab, (value) => {
   flex-wrap: wrap;
 }
 
+.user-search-filters {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  flex-wrap: wrap;
+}
+
 .user-search-count {
   color: $text-tertiary;
   font-size: $font-size-sm;