diff --git a/changelogs/fragments/51781-fixing-managed-disk-facts.yaml b/changelogs/fragments/51781-fixing-managed-disk-facts.yaml
new file mode 100644
index 0000000000..80b2940f6b
--- /dev/null
+++ b/changelogs/fragments/51781-fixing-managed-disk-facts.yaml
@@ -0,0 +1,2 @@
+bugfixes:
+  - azure_rm_managed_disk_facts - added missing implementation of listing managed disks by resource group
diff --git a/lib/ansible/modules/cloud/azure/azure_rm_managed_disk_facts.py b/lib/ansible/modules/cloud/azure/azure_rm_managed_disk_facts.py
index 6b2592a6f2..1664613024 100644
--- a/lib/ansible/modules/cloud/azure/azure_rm_managed_disk_facts.py
+++ b/lib/ansible/modules/cloud/azure/azure_rm_managed_disk_facts.py
@@ -175,7 +175,7 @@ class AzureRMManagedDiskFacts(AzureRMModuleBase):
 
         self.results['ansible_facts']['azure_managed_disk'] = (
             self.get_item() if self.name
-            else self.list_items()
+            else (self.list_items_by_resource_group() if self.resource_group else self.list_items())
         )
 
         return self.results
@@ -210,6 +210,19 @@ class AzureRMManagedDiskFacts(AzureRMModuleBase):
                 results.append(managed_disk_to_dict(item))
         return results
 
+    def list_items_by_resource_group(self):
+        """Get managed disks in a resource group"""
+        try:
+            response = self.compute_client.disks.list_by_resource_group(resource_group_name=self.resource_group)
+        except CloudError as exc:
+            self.fail('Failed to list items by resource group - {}'.format(str(exc)))
+
+        results = []
+        for item in response:
+            if self.has_tags(item.tags, self.tags):
+                results.append(managed_disk_to_dict(item))
+        return results
+
 
 def main():
     """Main module execution code path"""