diff --git a/src/deltaglider/client.py b/src/deltaglider/client.py
index 18659b9..37b3b36 100644
--- a/src/deltaglider/client.py
+++ b/src/deltaglider/client.py
@@ -8,6 +8,7 @@ from typing import Any
 
 from .adapters.storage_s3 import S3StorageAdapter
 from .core import DeltaService, DeltaSpace, ObjectKey
+from .core.errors import NotFoundError
 
 
 @dataclass
@@ -427,15 +428,23 @@ class DeltaGliderClient:
 
         Args:
             Bucket: S3 bucket name
-            Key: Object key
+            Key: Object key (can be with or without .delta suffix)
             **kwargs: Additional parameters
 
         Returns:
             Response dict with deletion details
         """
-        # Use core service's delta-aware delete
+        # Try to delete with the key as provided
         object_key = ObjectKey(bucket=Bucket, key=Key)
-        delete_result = self.service.delete(object_key)
+        try:
+            delete_result = self.service.delete(object_key)
+        except NotFoundError:
+            # Try with .delta suffix if not already present
+            if not Key.endswith(".delta"):
+                object_key = ObjectKey(bucket=Bucket, key=Key + ".delta")
+                delete_result = self.service.delete(object_key)
+            else:
+                raise
 
         response = {
             "DeleteMarker": False,
diff --git a/tests/integration/test_client.py b/tests/integration/test_client.py
index 88589de..827e43d 100644
--- a/tests/integration/test_client.py
+++ b/tests/integration/test_client.py
@@ -311,6 +311,24 @@ class TestBoto3Compatibility:
         assert response["ResponseMetadata"]["HTTPStatusCode"] == 204
         assert "test-bucket/to-delete.txt" not in client.service.storage.objects
 
+    def test_delete_object_with_delta_suffix_fallback(self, client):
+        """Test delete_object with automatic .delta suffix fallback."""
+        # Add object with .delta suffix (as DeltaGlider stores it)
+        client.service.storage.objects["test-bucket/file.zip.delta"] = {
+            "size": 100,
+            "metadata": {
+                "original_name": "file.zip",
+                "compression": "delta",
+            },
+        }
+
+        # Delete using original name (without .delta)
+        response = client.delete_object(Bucket="test-bucket", Key="file.zip")
+
+        assert response["ResponseMetadata"]["HTTPStatusCode"] == 204
+        assert response["DeltaGliderInfo"]["Deleted"] is True
+        assert "test-bucket/file.zip.delta" not in client.service.storage.objects
+
     def test_delete_objects(self, client):
         """Test batch delete."""
         # Add objects