diff --git a/CHANGES/5033.feature b/CHANGES/5033.feature
new file mode 100644
index 0000000000..4f960e320f
--- /dev/null
+++ b/CHANGES/5033.feature
@@ -0,0 +1 @@
+Added a serializer to output `pulp_last_updated` field on pulp resources.
diff --git a/pulpcore/app/serializers/base.py b/pulpcore/app/serializers/base.py
index 683eb8808e..3192769812 100644
--- a/pulpcore/app/serializers/base.py
+++ b/pulpcore/app/serializers/base.py
@@ -418,9 +418,17 @@ class ModelSerializer(
     exclude_arg_name = "exclude_fields"
 
     class Meta:
-        fields = ("pulp_href", "pulp_created")
+        fields = ("pulp_href", "pulp_created", "pulp_last_updated")
 
     pulp_created = serializers.DateTimeField(help_text=_("Timestamp of creation."), read_only=True)
+    pulp_last_updated = serializers.DateTimeField(
+        help_text=_(
+            "Timestamp of the last time this resource was updated. Note: for immutable "
+            "resources - like content, repository versions, and publication - pulp_created and "
+            "pulp_last_updated dates will be the same."
+        ),
+        read_only=True,
+    )
 
     def _validate_relative_path(self, path):
         """