diff --git a/CHANGELOG.md b/CHANGELOG.md
index b68cb121..562266bb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to
 
 - ✨(helm) support celery with our Django backend #1124
 - ✨(helm) support ingress for custom background image #1124
+- ✨(backend) add authenticated user rate throttling on request-entry #1129
 
 ### Changed
 
diff --git a/src/backend/core/api/throttling.py b/src/backend/core/api/throttling.py
index ecd4304b..b7b89b43 100644
--- a/src/backend/core/api/throttling.py
+++ b/src/backend/core/api/throttling.py
@@ -3,7 +3,7 @@
 from django.conf import settings
 
 from lasuite.drf.throttling import MonitoredThrottleMixin
-from rest_framework.throttling import AnonRateThrottle
+from rest_framework.throttling import AnonRateThrottle, UserRateThrottle
 from sentry_sdk import capture_message
 
 
@@ -16,6 +16,24 @@ class MonitoredAnonRateThrottle(MonitoredThrottleMixin, AnonRateThrottle):
     """Throttle for the monitored scoped rate throttle."""
 
 
+class MonitoredUserRateThrottle(MonitoredThrottleMixin, UserRateThrottle):
+    """Throttle for the monitored scoped rate throttle."""
+
+
+class RequestEntryAuthenticatedUserRateThrottle(MonitoredUserRateThrottle):
+    """Throttle authenticated user requesting room entry"""
+
+    scope = "request_entry"
+
+    def get_cache_key(self, request, view):
+        """Use the authenticated user ID as the throttle cache key."""
+
+        if request.user and not request.user.is_authenticated:
+            return None  # Defer to RequestEntryAnonRateThrottle for anonymous users.
+
+        return super().get_cache_key(request, view)
+
+
 class RequestEntryAnonRateThrottle(MonitoredAnonRateThrottle):
     """Throttle Anonymous user requesting room entry"""
 
diff --git a/src/backend/core/api/viewsets.py b/src/backend/core/api/viewsets.py
index 7a3cad78..8df8492d 100644
--- a/src/backend/core/api/viewsets.py
+++ b/src/backend/core/api/viewsets.py
@@ -393,7 +393,10 @@ class RoomViewSet(
         methods=["post"],
         url_path="request-entry",
         permission_classes=[],
-        throttle_classes=[throttling.RequestEntryAnonRateThrottle],
+        throttle_classes=[
+            throttling.RequestEntryAuthenticatedUserRateThrottle,
+            throttling.RequestEntryAnonRateThrottle,
+        ],
     )
     def request_entry(self, request, pk=None):  # pylint: disable=unused-argument
         """Request entry to a room"""