diff --git a/assets/admin/components/ui/ConfirmDialog.tsx b/assets/admin/components/ui/ConfirmDialog.tsx
index f031428b..1b9d298e 100644
--- a/assets/admin/components/ui/ConfirmDialog.tsx
+++ b/assets/admin/components/ui/ConfirmDialog.tsx
@@ -12,6 +12,8 @@ interface Props {
   loading?: boolean;
   onConfirm: () => void;
   onCancel: () => void;
+  /** محتوای اضافه زیر پیام (مثلاً فیلد دلیل). */
+  children?: React.ReactNode;
 }
 
 export default function ConfirmDialog({
@@ -24,6 +26,7 @@ export default function ConfirmDialog({
   loading = false,
   onConfirm,
   onCancel,
+  children,
 }: Props) {
   if (!open) return null;
 
@@ -48,6 +51,7 @@ export default function ConfirmDialog({
         </div>
         <div className="modal-body">
           <p style={{ color: 'var(--text-2)', lineHeight: 1.75, margin: 0 }}>{message}</p>
+          {children}
         </div>
         <div className="modal-foot" style={{ justifyContent: 'flex-end' }}>
           <button className="btn ghost sm" onClick={onCancel} disabled={loading}>
diff --git a/assets/admin/pages/AppointmentDetailPage.tsx b/assets/admin/pages/AppointmentDetailPage.tsx
index cf3e4756..b4f75619 100644
--- a/assets/admin/pages/AppointmentDetailPage.tsx
+++ b/assets/admin/pages/AppointmentDetailPage.tsx
@@ -5,7 +5,7 @@ import { ArrowRightIcon } from '@heroicons/react/24/outline';
 import { toast } from 'sonner';
 import { api } from '../lib/api';
 import type { ApiResponse } from '../lib/api';
-import type { Appointment, AppointmentStatus } from '../types';
+import type { Appointment, AppointmentStatus, AppointmentEvent } from '../types';
 import { formatDate, formatDateTime, toDate } from '../lib/utils';
 import PageHeader from '../components/ui/PageHeader';
 import StatusBadge from '../components/ui/StatusBadge';
@@ -50,6 +50,7 @@ export default function AppointmentDetailPage() {
   const navigate = useNavigate();
   const qc = useQueryClient();
   const [cancelOpen, setCancelOpen] = useState(false);
+  const [cancelReason, setCancelReason] = useState('');
   const [newStatus, setNewStatus] = useState('');
 
   const { data, isLoading } = useQuery({
@@ -58,22 +59,35 @@ export default function AppointmentDetailPage() {
     enabled: !!uuid,
   });
 
+  const eventsQuery = useQuery({
+    queryKey: ['appointment-events', uuid],
+    queryFn: () => api.get<ApiResponse<AppointmentEvent[]>>(`/api/v1/appointment/${uuid}/events`),
+    enabled: !!uuid,
+  });
+  const events: AppointmentEvent[] = (eventsQuery.data?.data as any) ?? [];
+
   const statusMutation = useMutation({
     mutationFn: (status: string) =>
       api.patch<ApiResponse<null>>(`/api/v1/appointment/${uuid}/status`, { status }),
     onSuccess: () => {
       toast.success('وضعیت نوبت بروزرسانی شد');
       qc.invalidateQueries({ queryKey: ['appointment', uuid] });
+      qc.invalidateQueries({ queryKey: ['appointment-events', uuid] });
     },
     onError: (err: Error) => toast.error(err.message),
   });
 
   const cancelMutation = useMutation({
-    mutationFn: () => api.patch<ApiResponse<null>>(`/api/v1/appointment/${uuid}/status`, { status: 'cancelled_by_doctor' }),
+    mutationFn: () => api.patch<ApiResponse<null>>(`/api/v1/appointment/${uuid}/status`, {
+      status: 'cancelled_by_doctor',
+      ...(cancelReason.trim() ? { cancel_reason: cancelReason.trim() } : {}),
+    }),
     onSuccess: () => {
       toast.success('نوبت لغو شد');
       setCancelOpen(false);
+      setCancelReason('');
       qc.invalidateQueries({ queryKey: ['appointment', uuid] });
+      qc.invalidateQueries({ queryKey: ['appointment-events', uuid] });
     },
     onError: (err: Error) => toast.error(err.message),
   });
@@ -161,6 +175,35 @@ export default function AppointmentDetailPage() {
               </button>
             </div>
           </div>
+
+          <div className="bg-white rounded-2xl border border-gray-100 shadow-sm p-6 lg:col-span-2">
+            <h3 className="font-semibold text-gray-800 mb-4">تاریخچه رویدادها</h3>
+            {eventsQuery.isLoading ? (
+              <div className="h-6 w-40 rounded skeleton" />
+            ) : events.length === 0 ? (
+              <p className="text-sm text-gray-400">رویدادی برای این نوبت ثبت نشده است.</p>
+            ) : (
+              <ol className="space-y-4">
+                {events.map((ev, i) => (
+                  <li key={i} className="flex gap-3">
+                    <span className="mt-1.5 w-2.5 h-2.5 rounded-full bg-red-500 shrink-0" />
+                    <div className="flex-1">
+                      <div className="flex items-center justify-between gap-2">
+                        <span className="text-sm font-medium text-gray-800">{ev.title}</span>
+                        <span className="text-xs text-gray-400">{formatDateTime(ev.created_at)}</span>
+                      </div>
+                      {ev.actor_name && (
+                        <div className="text-xs text-gray-500 mt-0.5">توسط: {ev.actor_name}</div>
+                      )}
+                      {ev.reason && (
+                        <div className="text-xs text-gray-600 mt-0.5">دلیل: {ev.reason}</div>
+                      )}
+                    </div>
+                  </li>
+                ))}
+              </ol>
+            )}
+          </div>
         </div>
       ) : (
         <div className="bg-white rounded-2xl border border-gray-100 p-16 text-center text-gray-400">
@@ -176,8 +219,20 @@ export default function AppointmentDetailPage() {
         danger
         loading={cancelMutation.isPending}
         onConfirm={() => cancelMutation.mutate()}
-        onCancel={() => setCancelOpen(false)}
-      />
+        onCancel={() => { setCancelOpen(false); setCancelReason(''); }}
+      >
+        <div style={{ marginTop: 14 }}>
+          <label className="cp-label mb-2">دلیل لغو (اختیاری)</label>
+          <textarea
+            className="cp-input"
+            rows={2}
+            value={cancelReason}
+            onChange={(e) => setCancelReason(e.target.value)}
+            placeholder="دلیل لغو نوبت را وارد کنید..."
+            style={{ width: '100%', resize: 'vertical' }}
+          />
+        </div>
+      </ConfirmDialog>
     </div>
   );
 }
diff --git a/assets/admin/types/index.ts b/assets/admin/types/index.ts
index bcec24e5..2a0a2b41 100644
--- a/assets/admin/types/index.ts
+++ b/assets/admin/types/index.ts
@@ -116,6 +116,14 @@ export interface Appointment {
     staff?: { uuid: string; full_name: string } | null;
 }
 
+export interface AppointmentEvent {
+    type: string;
+    title: string;
+    actor_name: string | null;
+    reason: string | null;
+    created_at: number;
+}
+
 export type PaymentStatus =
     | "pending"
     | "success"
diff --git a/docs/api/appointment.md b/docs/api/appointment.md
index fd9016e6..24d82ded 100644
--- a/docs/api/appointment.md
+++ b/docs/api/appointment.md
@@ -417,8 +417,9 @@ Change appointment status.
 ### Request Body
 ```json
 {
-  "status": "cancelled",
-  "version": 3
+  "status": "cancelled_by_doctor",
+  "version": 3,
+  "cancel_reason": "بیمار درخواست لغو داد"
 }
 ```
 
@@ -426,6 +427,7 @@ Change appointment status.
 |-------|------|----------|-------------|
 | `status` | string | ✅ | New status value |
 | `version` | integer | ❌ | Optimistic lock version (prevents double-submit) |
+| `cancel_reason` | string | ❌ | Only when transitioning to `cancelled_by_doctor` / `cancelled_by_user`. Stored on the recorded cancellation event (Timeline). Ignored for other statuses. |
 
 **Allowed Transitions by Role:**
 | Actor | Allowed transitions |
@@ -434,6 +436,8 @@ Change appointment status.
 | Doctor / Secretary | `pending → confirmed`, `confirmed → completed`, `confirmed → no_show` |
 | Admin | Any transition |
 
+> **Cancellation is logged.** When the status becomes `cancelled_by_doctor` or `cancelled_by_user`, an `AppointmentEvent` (type `cancelled`, title «نوبت لغو شد») is recorded with the actor (user id + name), the optional `cancel_reason`, and the cancel time — surfaced via `GET /api/v1/appointment/{uuid}/events`. A `warning`-level entry is also written to `app_log`.
+
 ### Response `200`
 Updated appointment object.
 
@@ -448,6 +452,42 @@ Updated appointment object.
 
 ---
 
+## GET `/api/v1/appointment/{uuid}/events`
+
+Appointment Timeline — chronological event history for one appointment. Currently records cancellation events; the structure is generic for future event types.
+
+**Permission:** `IS_AUTHENTICATED_FULLY` — caller must be able to manage the appointment (`canManage`).
+
+### Path Parameters
+| Param | Type | Description |
+|-------|------|-------------|
+| `uuid` | string (UUID) | Appointment UUID |
+
+### Response `200`
+```json
+{
+  "success": true,
+  "data": [
+    {
+      "type": "cancelled",
+      "title": "نوبت لغو شد",
+      "actor_name": "دکتر حامد حسینی",
+      "reason": "بیمار درخواست لغو داد",
+      "created_at": 1784273931
+    }
+  ]
+}
+```
+Events are ordered oldest → newest. `data` is a flat array (single nesting). `actor_name` and `reason` may be `null`. `created_at` is a Unix timestamp.
+
+### Errors
+| Code | HTTP | Description |
+|------|------|-------------|
+| `ERR_AUTH_006` | 403 | Not allowed to manage this appointment |
+| `ERR_VALIDATION_002` | 404 | Appointment not found |
+
+---
+
 ## POST `/api/v1/my/appointment`
 
 Create a new appointment for a patient. Used by doctor/clinic/secretary to book appointments on behalf of patients. If no user exists with the given mobile, a new user account is created automatically.
@@ -619,7 +659,7 @@ General update (ویرایش / جا به جایی / انتقال به رزرو /
 
 - `slot_start`/`slot_end` must be sent together; moving to an occupied slot → `409`.
 - Relation uuids: empty string clears; unknown uuid → `422`.
-- `status` follows the same transition rules as `PATCH /appointment/{uuid}/status`.
+- `status` follows the same transition rules as `PATCH /appointment/{uuid}/status`. A transition to `cancelled_by_doctor`/`cancelled_by_user` records a cancellation event (Timeline) + `app_log` warning; an optional `cancel_reason` body field is stored on the event.
 - Optimistic lock via `version` → `409` on concurrent edit.
 
 Response `200`: `{ success, data: { data: <appointment.toArray()> } }`
diff --git a/migrations/Version20260717073617.php b/migrations/Version20260717073617.php
new file mode 100644
index 00000000..b3bccfa2
--- /dev/null
+++ b/migrations/Version20260717073617.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20260717073617 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add appointment_events table (appointment Timeline / audit events)';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('CREATE TABLE appointment_events (id INT AUTO_INCREMENT NOT NULL, uuid VARCHAR(36) NOT NULL, type VARCHAR(40) NOT NULL, title VARCHAR(191) NOT NULL, actor_user_id INT DEFAULT NULL, actor_name VARCHAR(191) DEFAULT NULL, reason LONGTEXT DEFAULT NULL, created_at INT NOT NULL, appointment_id INT NOT NULL, UNIQUE INDEX UNIQ_14D9E804D17F50A6 (uuid), INDEX IDX_14D9E804E5B533F9 (appointment_id), INDEX idx_appointment_events_appt (appointment_id, created_at), PRIMARY KEY (id)) DEFAULT CHARACTER SET utf8mb4');
+        $this->addSql('ALTER TABLE appointment_events ADD CONSTRAINT FK_14D9E804E5B533F9 FOREIGN KEY (appointment_id) REFERENCES appointments (id) ON DELETE CASCADE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE appointment_events DROP FOREIGN KEY FK_14D9E804E5B533F9');
+        $this->addSql('DROP TABLE appointment_events');
+    }
+}
diff --git a/src/Appointment/Controller/AppointmentController.php b/src/Appointment/Controller/AppointmentController.php
index 0083bb77..d482baf6 100644
--- a/src/Appointment/Controller/AppointmentController.php
+++ b/src/Appointment/Controller/AppointmentController.php
@@ -36,8 +36,34 @@ class AppointmentController extends BaseController
         private readonly \App\ClinicService\Repository\ServiceSectionRepository $sectionRepo,
         private readonly \App\ClinicService\Repository\ServiceItemRepository $itemRepo,
         private readonly \App\Staff\Repository\ClinicStaffRepository $staffRepo,
+        private readonly \App\Appointment\Repository\AppointmentEventRepository $eventRepo,
+        private readonly \Psr\Log\LoggerInterface $logger,
     ) {}
 
+    private const CANCEL_STATUSES = [
+        Appointment::STATUS_CANCELLED_BY_DOCTOR,
+        Appointment::STATUS_CANCELLED_BY_USER,
+    ];
+
+    /**
+     * ثبت رویداد لغو در Timeline نوبت + لاگ سطح warning (تا در app_log هم persist شود).
+     * بعد از ذخیره‌ی موفق نوبت صدا زده می‌شود.
+     */
+    private function recordCancellation(Appointment $appointment, string $status, ?string $reason, User $user): void
+    {
+        $actorName = $user->getRealName() ?: $user->getMobileNumber();
+
+        $event = new \App\Appointment\Entity\AppointmentEvent($appointment, \App\Appointment\Entity\AppointmentEvent::TYPE_CANCELLED, 'نوبت لغو شد');
+        $event->setActor($user->getId(), $actorName);
+        $event->setReason($reason);
+        $this->eventRepo->save($event);
+
+        $this->logger->warning(sprintf(
+            'Appointment cancelled: uuid=%s status=%s by user=%d(%s) reason=%s',
+            $appointment->getUuid(), $status, (int) $user->getId(), $actorName, $reason ?? '-'
+        ));
+    }
+
     // ── Public: available slots ───────────────────────────────────────────────
 
     #[OA\Get(
@@ -665,6 +691,11 @@ class AppointmentController extends BaseController
             $this->patientService->autoCreateOnAppointmentConfirm($appointment);
         }
 
+        if (in_array($newStatus, self::CANCEL_STATUSES, true)) {
+            $reason = isset($data['cancel_reason']) ? trim((string) $data['cancel_reason']) : '';
+            $this->recordCancellation($appointment, $newStatus, $reason !== '' ? $reason : null, $user);
+        }
+
         return $this->success(['data' => $appointment->toArray()]);
     }
 
@@ -750,7 +781,8 @@ class AppointmentController extends BaseController
         }
 
         // Optional status transition, same rules as the dedicated endpoint.
-        $newStatus = trim((string) ($data['status'] ?? ''));
+        $newStatus     = trim((string) ($data['status'] ?? ''));
+        $cancelledTo   = null;
         if ($newStatus !== '' && $newStatus !== $appointment->getStatus()) {
             if (!$appointment->canTransitionTo($newStatus)) {
                 return $this->error(ErrorCodes::ERR_VALIDATION_001, sprintf(
@@ -761,6 +793,9 @@ class AppointmentController extends BaseController
             if ($newStatus === Appointment::STATUS_CONFIRMED) {
                 $this->patientService->autoCreateOnAppointmentConfirm($appointment);
             }
+            if (in_array($newStatus, self::CANCEL_STATUSES, true)) {
+                $cancelledTo = $newStatus;
+            }
         }
 
         try {
@@ -772,6 +807,28 @@ class AppointmentController extends BaseController
             return $this->error(ErrorCodes::ERR_CONFLICT_001, 'این بازه زمانی قبلاً رزرو شده است', 409, 'slot_start');
         }
 
+        if ($cancelledTo !== null) {
+            $reason = isset($data['cancel_reason']) ? trim((string) $data['cancel_reason']) : '';
+            $this->recordCancellation($appointment, $cancelledTo, $reason !== '' ? $reason : null, $user);
+        }
+
         return $this->success(['data' => $appointment->toArray()]);
     }
+
+    // ── Timeline: رویدادهای یک نوبت ───────────────────────────────────────────
+
+    #[Route('/api/v1/appointment/{uuid}/events', methods: ['GET'])]
+    #[IsGranted('IS_AUTHENTICATED_FULLY')]
+    public function events(string $uuid, #[CurrentUser] User $user): JsonResponse
+    {
+        $appointment = $this->appointmentRepo->findByUuid($uuid);
+        if ($appointment === null) {
+            return $this->error(ErrorCodes::ERR_VALIDATION_002, 'نوبت یافت نشد', 404);
+        }
+        if (!$this->canManage($appointment, $user)) {
+            return $this->error(ErrorCodes::ERR_AUTH_006, 'دسترسی ممنوع', 403);
+        }
+
+        return $this->success($this->eventRepo->findByAppointmentUuid($uuid));
+    }
 }
diff --git a/src/Appointment/Entity/AppointmentEvent.php b/src/Appointment/Entity/AppointmentEvent.php
new file mode 100644
index 00000000..b197b3cc
--- /dev/null
+++ b/src/Appointment/Entity/AppointmentEvent.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace App\Appointment\Entity;
+
+use App\Appointment\Repository\AppointmentEventRepository;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Uid\Uuid;
+
+/**
+ * تاریخچه‌ی رویدادهای یک نوبت (Timeline). فعلاً فقط رویداد لغو ثبت می‌شود، اما
+ * ساختار عمومی است تا رویدادهای بعدی (ایجاد/تأیید/جابه‌جایی) هم قابل افزودن باشند.
+ */
+#[ORM\Entity(repositoryClass: AppointmentEventRepository::class)]
+#[ORM\Table(name: 'appointment_events')]
+#[ORM\Index(columns: ['appointment_id', 'created_at'], name: 'idx_appointment_events_appt')]
+class AppointmentEvent
+{
+    public const TYPE_CANCELLED = 'cancelled';
+
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column(type: 'integer')]
+    private ?int $id = null;
+
+    #[ORM\Column(type: 'string', length: 36, unique: true)]
+    private string $uuid;
+
+    #[ORM\ManyToOne(targetEntity: Appointment::class)]
+    #[ORM\JoinColumn(name: 'appointment_id', nullable: false, onDelete: 'CASCADE')]
+    private Appointment $appointment;
+
+    #[ORM\Column(type: 'string', length: 40)]
+    private string $type;
+
+    #[ORM\Column(type: 'string', length: 191)]
+    private string $title;
+
+    // کاربرِ عاملِ رویداد (مثلاً لغوکننده)؛ null برای رویدادهای سیستمی.
+    #[ORM\Column(name: 'actor_user_id', type: 'integer', nullable: true)]
+    private ?int $actorUserId = null;
+
+    // کشِ نام عامل برای نمایش بدون join اضافه.
+    #[ORM\Column(name: 'actor_name', type: 'string', length: 191, nullable: true)]
+    private ?string $actorName = null;
+
+    #[ORM\Column(type: 'text', nullable: true)]
+    private ?string $reason = null;
+
+    #[ORM\Column(name: 'created_at', type: 'integer')]
+    private int $createdAt;
+
+    public function __construct(Appointment $appointment, string $type, string $title)
+    {
+        $this->uuid        = Uuid::v4()->toRfc4122();
+        $this->appointment = $appointment;
+        $this->type        = $type;
+        $this->title       = $title;
+        $this->createdAt   = time();
+    }
+
+    public function setActor(?int $userId, ?string $name): self { $this->actorUserId = $userId; $this->actorName = $name; return $this; }
+    public function setReason(?string $reason): self { $this->reason = $reason; return $this; }
+
+    public function getUuid(): string { return $this->uuid; }
+
+    public function toArray(): array
+    {
+        return [
+            'uuid'       => $this->uuid,
+            'type'       => $this->type,
+            'title'      => $this->title,
+            'actor_name' => $this->actorName,
+            'reason'     => $this->reason,
+            'created_at' => $this->createdAt,
+        ];
+    }
+}
diff --git a/src/Appointment/Repository/AppointmentEventRepository.php b/src/Appointment/Repository/AppointmentEventRepository.php
new file mode 100644
index 00000000..6d5d33f5
--- /dev/null
+++ b/src/Appointment/Repository/AppointmentEventRepository.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Appointment\Repository;
+
+use App\Appointment\Entity\AppointmentEvent;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+class AppointmentEventRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry) { parent::__construct($registry, AppointmentEvent::class); }
+
+    public function save(AppointmentEvent $e, bool $flush = true): void
+    {
+        $this->getEntityManager()->persist($e);
+        if ($flush) {
+            $this->getEntityManager()->flush();
+        }
+    }
+
+    /** رویدادهای یک نوبت به‌ترتیب زمان (قدیمی → جدید)، به‌صورت آرایه. */
+    public function findByAppointmentUuid(string $appointmentUuid): array
+    {
+        return $this->createQueryBuilder('e')
+            ->select('e.type AS type', 'e.title AS title', 'e.actorName AS actor_name', 'e.reason AS reason', 'e.createdAt AS created_at')
+            ->join('e.appointment', 'a')
+            ->where('a.uuid = :uuid')->setParameter('uuid', $appointmentUuid)
+            ->orderBy('e.createdAt', 'ASC')
+            ->getQuery()->getArrayResult();
+    }
+}