diff --git a/fe-admin/src/pages/master/DepartmentsPage.tsx b/fe-admin/src/pages/master/DepartmentsPage.tsx
index ffdf7ef..657525c 100644
--- a/fe-admin/src/pages/master/DepartmentsPage.tsx
+++ b/fe-admin/src/pages/master/DepartmentsPage.tsx
@@ -8,6 +8,7 @@ import { PermissionGuard } from '@/components/PermissionGuard'
 import { Button } from '@/components/ui/Button'
 import { Input } from '@/components/ui/Input'
 import { Label } from '@/components/ui/Label'
+import { Select } from '@/components/ui/Select'
 import { Textarea } from '@/components/ui/Textarea'
 import { Dialog } from '@/components/ui/Dialog'
 import { api } from '@/lib/api'
@@ -15,8 +16,8 @@ import { getErrorMessage } from '@/lib/apiError'
 import { MenuKeys } from '@/lib/menuKeys'
 import type { Department, Paged } from '@/types/master'
 
-type FormState = { id?: string; code: string; name: string; note: string }
-const emptyForm: FormState = { code: '', name: '', note: '' }
+type FormState = { id?: string; code: string; name: string; parentId: string; note: string }
+const emptyForm: FormState = { code: '', name: '', parentId: '', note: '' }
 
 export function DepartmentsPage() {
   const qc = useQueryClient()
@@ -38,9 +39,24 @@ export function DepartmentsPage() {
     },
   })
 
+  // Toàn bộ phòng ban (không phân trang) để chọn "Phòng cha" + tra tên phòng cha cho cột bảng.
+  const allDepts = useQuery({
+    queryKey: ['departments-all'],
+    queryFn: async () =>
+      (await api.get<Paged<Department>>('/departments', { params: { page: 1, pageSize: 200 } })).data.items,
+  })
+  const deptNameById = new Map((allDepts.data ?? []).map(d => [d.id, `${d.code} — ${d.name}`]))
+
   const mutate = useMutation({
     mutationFn: async (d: FormState) => {
-      const payload = { id: d.id, code: d.code, name: d.name, managerUserId: null, note: d.note || null }
+      const payload = {
+        id: d.id,
+        code: d.code,
+        name: d.name,
+        parentId: d.parentId || null,
+        managerUserId: null,
+        note: d.note || null,
+      }
       if (d.id) await api.put(`/departments/${d.id}`, payload)
       else await api.post('/departments', payload)
     },
@@ -65,6 +81,7 @@ export function DepartmentsPage() {
   const columns: Column<Department>[] = [
     { key: 'code', header: 'Mã', sortable: true, render: d => <span className="font-mono text-xs">{d.code}</span>, width: 'w-32' },
     { key: 'name', header: 'Tên phòng ban', sortable: true, render: d => d.name },
+    { key: 'parentId', header: 'Thuộc', render: d => (d.parentId ? deptNameById.get(d.parentId) ?? '—' : '—') },
     { key: 'note', header: 'Ghi chú', render: d => d.note ?? '—' },
     {
       key: 'actions',
@@ -75,7 +92,7 @@ export function DepartmentsPage() {
         <div className="flex justify-end gap-1">
           <PermissionGuard menuKey={MenuKeys.Departments} action="Update">
             <Button size="sm" variant="ghost" onClick={() => {
-              setForm({ id: d.id, code: d.code, name: d.name, note: d.note ?? '' })
+              setForm({ id: d.id, code: d.code, name: d.name, parentId: d.parentId ?? '', note: d.note ?? '' })
               setOpen(true)
             }}>
               <Pencil className="h-3.5 w-3.5" />
@@ -149,6 +166,17 @@ export function DepartmentsPage() {
             <Label>Tên phòng ban *</Label>
             <Input value={form.name} onChange={e => setForm({ ...form, name: e.target.value })} required />
           </div>
+          <div className="space-y-1.5">
+            <Label>Phòng cha (Thuộc khối/phòng)</Label>
+            <Select value={form.parentId} onChange={e => setForm({ ...form, parentId: e.target.value })}>
+              <option value="">— Không có (cấp gốc) —</option>
+              {(allDepts.data ?? [])
+                .filter(d => d.id !== form.id)
+                .map(d => (
+                  <option key={d.id} value={d.id}>{d.code} — {d.name}</option>
+                ))}
+            </Select>
+          </div>
           <div className="space-y-1.5">
             <Label>Ghi chú</Label>
             <Textarea rows={3} value={form.note} onChange={e => setForm({ ...form, note: e.target.value })} />
diff --git a/fe-admin/src/types/master.ts b/fe-admin/src/types/master.ts
index 1dc5980..68cad30 100644
--- a/fe-admin/src/types/master.ts
+++ b/fe-admin/src/types/master.ts
@@ -66,6 +66,7 @@ export type Department = {
   id: string
   code: string
   name: string
+  parentId: string | null
   managerUserId: string | null
   note: string | null
   createdAt: string