diff --git a/src/reserves/reserve-automation.service.ts b/src/reserves/reserve-automation.service.ts
new file mode 100644
index 0000000..c574643
--- /dev/null
+++ b/src/reserves/reserve-automation.service.ts
@@ -0,0 +1,27 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { Cron, CronExpression } from '@nestjs/schedule';
+import { ReservesService } from './reserves.service';
+
+@Injectable()
+export class ReserveAutomationService {
+  private readonly logger = new Logger(ReserveAutomationService.name);
+
+  constructor(private readonly reservesService: ReservesService) {}
+
+  /**
+   * Marks past reserves without a final status as completed once at least one
+   * full day has passed since the appointment date.
+   */
+  @Cron(CronExpression.EVERY_DAY_AT_MIDNIGHT, {
+    name: 'auto-complete-past-reserves',
+  })
+  async autoCompletePastReserves(): Promise<number> {
+    const updatedCount = await this.reservesService.autoCompletePastReserves();
+
+    this.logger.log(
+      `Auto-completed ${updatedCount} past reserves without a final status`,
+    );
+
+    return updatedCount;
+  }
+}
diff --git a/src/reserves/reserves.module.ts b/src/reserves/reserves.module.ts
index aaa724b..a0ad03b 100644
--- a/src/reserves/reserves.module.ts
+++ b/src/reserves/reserves.module.ts
@@ -13,6 +13,7 @@ import { StylistsModule } from '../stylists/stylists.module';
 import { ReserveItem } from './entities/reserve-item.entity';
 import { ReserveStatusHistory } from './entities/reserve-status-history.entity';
 import { Reserve } from './entities/reserve.entity';
+import { ReserveAutomationService } from './reserve-automation.service';
 import { ReservesController } from './reserves.controller';
 import { ReservesService } from './reserves.service';
 
@@ -35,7 +36,7 @@ import { ReservesService } from './reserves.service';
     NotificationsModule,
   ],
   controllers: [ReservesController],
-  providers: [ReservesService],
+  providers: [ReservesService, ReserveAutomationService],
   exports: [ReservesService],
 })
 export class ReservesModule {}
diff --git a/src/reserves/reserves.service.ts b/src/reserves/reserves.service.ts
index 4176176..5850846 100644
--- a/src/reserves/reserves.service.ts
+++ b/src/reserves/reserves.service.ts
@@ -5,7 +5,7 @@ import {
   NotFoundException,
 } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
-import { Repository } from 'typeorm';
+import { In, LessThan, Repository } from 'typeorm';
 import { AuthorizationService } from '../authorization/authorization.service';
 import { ReservePolicy } from '../authorization/policies/reserve.policy';
 import { AuthUser } from '../auth/interfaces/auth-user.interface';
@@ -292,6 +292,32 @@ export class ReservesService {
     });
   }
 
+  async autoCompletePastReserves(): Promise<number> {
+    const today = this.getTodayDateString();
+    const reserves = await this.reservesRepository.find({
+      where: {
+        status: In([ReserveStatus.PENDING, ReserveStatus.CONFIRMED]),
+        appointmentDate: LessThan(today),
+      },
+    });
+
+    for (const reserve of reserves) {
+      await this.logStatusChange(
+        reserve.id,
+        reserve.status,
+        ReserveStatus.COMPLETED,
+        null,
+      );
+      reserve.status = ReserveStatus.COMPLETED;
+    }
+
+    if (reserves.length > 0) {
+      await this.reservesRepository.save(reserves);
+    }
+
+    return reserves.length;
+  }
+
   async confirmDepositPayment(
     reserveId: string,
     changedByUserId: string | null,
@@ -359,6 +385,10 @@ export class ReservesService {
     return time.length === 5 ? `${time}:00` : time;
   }
 
+  private getTodayDateString(): string {
+    return new Date().toISOString().slice(0, 10);
+  }
+
   private async validateItems(items: CreateReserveDto['items']): Promise<void> {
     for (const item of items) {
       const serviceExists = await this.servicesRepository.existsBy({