diff --git a/CHANGELOG.md b/CHANGELOG.md
index d1fc665048..d1a2e19679 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -102,6 +102,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
     * Some configuration errors that were previously raised as `MisconfigurationException`s will now be raised as `ProcessRaisedException` (torch>=1.8) or as `Exception` (torch<1.8)
 
 
+- Removed duplicated file extension when uploading model checkpoints with `NeptuneLogger` ([#11015](https://github.com/PyTorchLightning/pytorch-lightning/pull/11015))
+
+
 ### Deprecated
 
 - Deprecated `ClusterEnvironment.master_{address,port}` in favor of `ClusterEnvironment.main_{address,port}` ([#10103](https://github.com/PyTorchLightning/pytorch-lightning/issues/10103))
diff --git a/pytorch_lightning/loggers/neptune.py b/pytorch_lightning/loggers/neptune.py
index 569223754e..398b93e06c 100644
--- a/pytorch_lightning/loggers/neptune.py
+++ b/pytorch_lightning/loggers/neptune.py
@@ -553,7 +553,10 @@ class NeptuneLogger(LightningLoggerBase):
         expected_model_path = f"{checkpoint_callback.dirpath}{os.path.sep}"
         if not model_path.startswith(expected_model_path):
             raise ValueError(f"{model_path} was expected to start with {expected_model_path}.")
-        return model_path[len(expected_model_path) :]
+        # Remove extension from filepath
+        filepath, _ = os.path.splitext(model_path[len(expected_model_path) :])
+
+        return filepath
 
     @classmethod
     def _get_full_model_names_from_exp_structure(cls, exp_structure: dict, namespace: str) -> Set[str]:
diff --git a/tests/loggers/test_neptune.py b/tests/loggers/test_neptune.py
index 6238b408c1..cb7ef9c515 100644
--- a/tests/loggers/test_neptune.py
+++ b/tests/loggers/test_neptune.py
@@ -397,9 +397,9 @@ class TestNeptuneLoggerUtils(unittest.TestCase):
         # given:
         SimpleCheckpoint = namedtuple("SimpleCheckpoint", ["dirpath"])
         test_input_data = [
-            ("key.ext", os.path.join("foo", "bar", "key.ext"), SimpleCheckpoint(dirpath=os.path.join("foo", "bar"))),
+            ("key", os.path.join("foo", "bar", "key.ext"), SimpleCheckpoint(dirpath=os.path.join("foo", "bar"))),
             (
-                "key/in/parts.ext",
+                "key/in/parts",
                 os.path.join("foo", "bar", "key/in/parts.ext"),
                 SimpleCheckpoint(dirpath=os.path.join("foo", "bar")),
             ),