diff --git a/py/src/braintrust/logger.py b/py/src/braintrust/logger.py
index 7c89d51a..9b8a2c0a 100644
--- a/py/src/braintrust/logger.py
+++ b/py/src/braintrust/logger.py
@@ -109,6 +109,7 @@
     merge_dicts,
     response_raise_for_status,
 )
+from .version import VERSION
 from .xact_ids import prettify_xact
 
 
@@ -828,6 +829,9 @@ def _set_adapter(self, adapter: HTTPAdapter | None) -> None:
 
     def _reset(self, **retry_kwargs: Any) -> None:
         self.session = requests.Session()
+        # Identifies SDK-originated traffic so the backend can attribute object
+        # creation to the Python SDK.
+        self.session.headers.update({"User-Agent": f"braintrust-python/{VERSION}"})
 
         adapter = self.adapter
         if adapter is None: