diff --git a/src/database/migrations/1789046800000-AddBookingCancellationReason.ts b/src/database/migrations/1789046800000-AddBookingCancellationReason.ts
new file mode 100644
index 0000000..1a5a92b
--- /dev/null
+++ b/src/database/migrations/1789046800000-AddBookingCancellationReason.ts
@@ -0,0 +1,21 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class AddBookingCancellationReason1789046800000
+  implements MigrationInterface
+{
+  name = 'AddBookingCancellationReason1789046800000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE "bookings"
+      ADD COLUMN IF NOT EXISTS "cancellationReason" text
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE "bookings"
+      DROP COLUMN IF EXISTS "cancellationReason"
+    `);
+  }
+}
diff --git a/src/entities/booking.entity.ts b/src/entities/booking.entity.ts
index e98e837..bdec315 100644
--- a/src/entities/booking.entity.ts
+++ b/src/entities/booking.entity.ts
@@ -66,6 +66,9 @@ export class BookingEntity {
   @Column({ type: 'text', nullable: true })
   note!: string | null;
 
+  @Column({ type: 'text', nullable: true })
+  cancellationReason!: string | null;
+
   @CreateDateColumn()
   createdAt!: Date;
 
diff --git a/src/modules/bookings/bookings.controller.ts b/src/modules/bookings/bookings.controller.ts
index dfebe3e..6902d78 100644
--- a/src/modules/bookings/bookings.controller.ts
+++ b/src/modules/bookings/bookings.controller.ts
@@ -20,6 +20,7 @@ import { RolesGuard } from '../auth/guards/roles.guard';
 import { BookingsService } from './bookings.service';
 import { CreateBookingDto } from './dto/create-booking.dto';
 import { CreateBookingBatchDto } from './dto/create-booking-batch.dto';
+import { CancelBookingDto } from './dto/cancel-booking.dto';
 import { UpdateBookingDto } from './dto/update-booking.dto';
 
 @Controller('bookings')
@@ -128,9 +129,10 @@ export class BookingsController {
   @Roles(UserRole.ADMIN, UserRole.BUSINESS_OWNER, UserRole.CUSTOMER)
   cancel(
     @Param('id') id: string,
+    @Body() payload: CancelBookingDto,
     @CurrentUser() user: AuthUser,
   ): Promise<BookingEntity> {
-    return this.service.cancel(id, user);
+    return this.service.cancel(id, user, payload);
   }
 
   @Delete(':id')
diff --git a/src/modules/bookings/bookings.service.ts b/src/modules/bookings/bookings.service.ts
index dcb9b3c..cf95376 100644
--- a/src/modules/bookings/bookings.service.ts
+++ b/src/modules/bookings/bookings.service.ts
@@ -324,9 +324,22 @@ export class BookingsService {
     return this.repo.save(row);
   }
 
-  async cancel(id: string, actor?: AuthUser): Promise<BookingEntity> {
+  async cancel(
+    id: string,
+    actor?: AuthUser,
+    payload?: { cancellationReason?: string },
+  ): Promise<BookingEntity> {
     const row = await this.findOne(id);
     this.assertCanCancelBooking(row, actor);
+
+    const reason = payload?.cancellationReason?.trim() ?? '';
+    if (actor?.role === UserRole.BUSINESS_OWNER && !reason) {
+      throw new BadRequestException('Cancellation reason is required');
+    }
+    if (reason) {
+      row.cancellationReason = reason;
+    }
+
     this.applyStatusTransition(row, BookingStatus.CANCELLED, actor);
     return this.repo.save(row);
   }
diff --git a/src/modules/bookings/dto/cancel-booking.dto.ts b/src/modules/bookings/dto/cancel-booking.dto.ts
new file mode 100644
index 0000000..65603a3
--- /dev/null
+++ b/src/modules/bookings/dto/cancel-booking.dto.ts
@@ -0,0 +1,10 @@
+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsOptional, IsString, MaxLength } from 'class-validator';
+
+export class CancelBookingDto {
+  @ApiPropertyOptional({ example: 'ظرفیت این بازه تکمیل شده است.' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  cancellationReason?: string;
+}