diff --git a/litellm/llms/databricks/common_utils.py b/litellm/llms/databricks/common_utils.py
index 608f29a03a7..afbf7c5df81 100644
--- a/litellm/llms/databricks/common_utils.py
+++ b/litellm/llms/databricks/common_utils.py
@@ -387,8 +387,10 @@ class DatabricksBase:
         if api_key is not None:
             headers["Authorization"] = f"Bearer {api_key}"
 
-        # Set User-Agent with optional custom prefix
-        headers["User-Agent"] = self._build_user_agent(custom_user_agent)
+        # Set User-Agent with optional custom prefix, but don't overwrite
+        # if the caller explicitly set one (e.g. via extra_headers)
+        if "User-Agent" not in headers:
+            headers["User-Agent"] = self._build_user_agent(custom_user_agent)
 
         # Debug logging with redaction (never log actual tokens)
         verbose_logger.debug(
diff --git a/tests/test_litellm/llms/databricks/test_databricks_partner_integration.py b/tests/test_litellm/llms/databricks/test_databricks_partner_integration.py
index 800066ac5bf..aa7901598dd 100644
--- a/tests/test_litellm/llms/databricks/test_databricks_partner_integration.py
+++ b/tests/test_litellm/llms/databricks/test_databricks_partner_integration.py
@@ -334,6 +334,40 @@ class TestValidateEnvironmentUserAgent:
 
         assert headers["User-Agent"].startswith("mycompany_litellm/")
 
+    def test_extra_headers_user_agent_preserved(self, monkeypatch):
+        """User-Agent set via headers dict (extra_headers) is not overwritten."""
+        monkeypatch.delenv("DATABRICKS_CLIENT_ID", raising=False)
+        monkeypatch.delenv("DATABRICKS_CLIENT_SECRET", raising=False)
+
+        databricks_base = DatabricksBase()
+
+        api_base, headers = databricks_base.databricks_validate_environment(
+            api_key="test-key",
+            api_base="https://adb-123.net/serving-endpoints",
+            endpoint_type="chat_completions",
+            custom_endpoint=False,
+            headers={"User-Agent": "My-Custom-Agent/1.0"},
+        )
+
+        assert headers["User-Agent"] == "My-Custom-Agent/1.0"
+
+    def test_default_user_agent_when_not_in_headers(self, monkeypatch):
+        """Default User-Agent is set when headers dict has no User-Agent."""
+        monkeypatch.delenv("DATABRICKS_CLIENT_ID", raising=False)
+        monkeypatch.delenv("DATABRICKS_CLIENT_SECRET", raising=False)
+
+        databricks_base = DatabricksBase()
+
+        api_base, headers = databricks_base.databricks_validate_environment(
+            api_key="test-key",
+            api_base="https://adb-123.net/serving-endpoints",
+            endpoint_type="chat_completions",
+            custom_endpoint=False,
+            headers={},
+        )
+
+        assert headers["User-Agent"].startswith("litellm/")
+
 
 class TestSDKPartnerTelemetry:
     """Test that SDK partner telemetry is registered."""