diff --git a/backend/flaschengeist_events/event_controller.py b/backend/flaschengeist_events/event_controller.py
index a3853c4..802a1d2 100644
--- a/backend/flaschengeist_events/event_controller.py
+++ b/backend/flaschengeist_events/event_controller.py
@@ -1,7 +1,8 @@
 from datetime import datetime, timedelta, timezone
 from enum import IntEnum
-from typing import Optional, Tuple
-from flaschengeist.models import UtcDateTime
+from typing import Optional, Tuple, Union
+from flaschengeist.controller import userController
+from flaschengeist.models import Notification, UtcDateTime
 from flaschengeist.models.user import User
 
 from werkzeug.exceptions import BadRequest, Conflict, NotFound
@@ -364,9 +365,21 @@ def get_invitations(user: User):
     ).all()
 
 
+def cleanup_notifications(inv: Invitation):
+    notifications = tuple(
+        filter(
+            lambda notification: notification.data.get("invitation") == inv.id, EventPlugin.getPlugin().notifications
+        )
+    )
+    for notification in notifications:
+        db.session.delete(notification)
+        db.session.commit()
+
+
 def cancel_invitation(inv: Invitation):
     db.session.delete(inv)
     db.session.commit()
+    cleanup_notifications(inv)
 
 
 def respond_invitation(invite: Invitation, accepted=True):