diff --git a/actions/admin/users.ts b/actions/admin/users.ts
new file mode 100644
index 0000000..c7698fa
--- /dev/null
+++ b/actions/admin/users.ts
@@ -0,0 +1,43 @@
+'use server'
+
+import { revalidatePath } from 'next/cache'
+import { z } from 'zod'
+import { Role } from '@prisma/client'
+import { prisma } from '@/lib/prisma'
+import { requireAdmin } from '@/lib/auth-guard'
+
+export async function deleteUserAction(userId: string) {
+  const session = await requireAdmin()
+  if (userId === session.userId) {
+    throw new Error('Zelfverwijdering niet toegestaan')
+  }
+  await prisma.user.delete({ where: { id: userId } })
+  revalidatePath('/admin/users')
+}
+
+const rolesSchema = z.array(z.nativeEnum(Role))
+
+export async function updateUserRolesAction(userId: string, roles: Role[]) {
+  const session = await requireAdmin()
+
+  const parsed = rolesSchema.safeParse(roles)
+  if (!parsed.success) {
+    throw new Error('Ongeldige rol-waarden')
+  }
+
+  if (userId === session.userId && !parsed.data.includes(Role.ADMIN)) {
+    throw new Error('Kan eigen ADMIN-rol niet verwijderen')
+  }
+
+  await prisma.$transaction([
+    prisma.userRole.deleteMany({ where: { user_id: userId } }),
+    ...parsed.data.map((role) => prisma.userRole.create({ data: { user_id: userId, role } })),
+  ])
+  revalidatePath('/admin/users')
+}
+
+export async function setMustResetPasswordAction(userId: string, value: boolean) {
+  await requireAdmin()
+  await prisma.user.update({ where: { id: userId }, data: { must_reset_password: value } })
+  revalidatePath('/admin/users')
+}
diff --git a/lib/auth-guard.ts b/lib/auth-guard.ts
index 8b6baf5..e82a568 100644
--- a/lib/auth-guard.ts
+++ b/lib/auth-guard.ts
@@ -22,3 +22,11 @@ export async function requireSession() {
 
   return session
 }
+
+export async function requireAdmin() {
+  const session = await getSession()
+  if (!session.userId || !session.isAdmin) {
+    redirect('/dashboard')
+  }
+  return session
+}
diff --git a/lib/session.ts b/lib/session.ts
index bf1f9a9..5d7c587 100644
--- a/lib/session.ts
+++ b/lib/session.ts
@@ -3,6 +3,7 @@ import { SessionOptions } from 'iron-session'
 export interface SessionData {
   userId: string
   isDemo: boolean
+  isAdmin: boolean
   // ST-1002 (M10) — gezet door /api/auth/pair/claim na een succesvolle QR-pairing.
   // Beide velden zijn optioneel zodat bestaande wachtwoord-sessies onveranderd blijven.
   paired?: boolean