diff --git a/packages/http/httpx/kiota_http/httpx_request_adapter.py b/packages/http/httpx/kiota_http/httpx_request_adapter.py
index c63f3907..27faeb95 100644
--- a/packages/http/httpx/kiota_http/httpx_request_adapter.py
+++ b/packages/http/httpx/kiota_http/httpx_request_adapter.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import re
+import warnings
 from datetime import datetime
 from typing import Any, Optional, TypeVar, Union
 from urllib import parse
@@ -87,7 +88,16 @@ def __init__(
         if not http_client:
             http_client = KiotaClientFactory.create_with_default_middleware()
         self._http_client: httpx.AsyncClient = http_client
-        self._base_url: str = str(http_client.base_url) if http_client.base_url is not None else ""
+        if base_url is not None:
+            warnings.warn(
+                "The base_url argument is deprecated. "
+                "Set base_url on the http_client or on the request adapter instead.",
+                DeprecationWarning,
+                stacklevel=2
+            )
+        if not base_url:
+            base_url = str(http_client.base_url) if http_client.base_url is not None else ""
+        self._base_url: str = base_url
         if not observability_options:
             observability_options = ObservabilityOptions()
         self.observability_options = observability_options
diff --git a/packages/http/httpx/tests/test_httpx_request_adapter.py b/packages/http/httpx/tests/test_httpx_request_adapter.py
index 173cb6aa..5a9ebe67 100644
--- a/packages/http/httpx/tests/test_httpx_request_adapter.py
+++ b/packages/http/httpx/tests/test_httpx_request_adapter.py
@@ -1,5 +1,6 @@
 import asyncio
 import logging
+import warnings
 from unittest.mock import AsyncMock, Mock, call, patch
 from urllib.parse import unquote
 
@@ -626,11 +627,26 @@ async def test_send_primitive_async_302_with_location_header_does_not_throw(
     assert "location" in resp.headers
     await request_adapter.send_primitive_async(request_info, "float", {})
 
-def test_httpx_request_adapter_ignores_base_url_parameter(auth_provider):
-    request_adapter = HttpxRequestAdapter(auth_provider, base_url="https://no.com")
-    assert request_adapter.base_url == ""
+def test_httpx_request_adapter_uses_base_url_parameter(auth_provider):
+    with pytest.warns(DeprecationWarning, match="base_url argument is deprecated"):
+        request_adapter = HttpxRequestAdapter(auth_provider, base_url="https://no.com")
+    assert request_adapter.base_url == "https://no.com"
+
+def test_httpx_request_adapter_base_url_parameter_wins_over_http_client(auth_provider):
+    http_client = httpx.AsyncClient(base_url=BASE_URL)
+    with pytest.warns(DeprecationWarning, match="base_url argument is deprecated"):
+        request_adapter = HttpxRequestAdapter(auth_provider, http_client=http_client, base_url="https://no.com")
+    assert request_adapter.base_url == "https://no.com"
+
+def test_httpx_request_adapter_empty_base_url_parameter_warns_and_uses_http_client(auth_provider):
+    http_client = httpx.AsyncClient(base_url=BASE_URL)
+    with pytest.warns(DeprecationWarning, match="base_url argument is deprecated"):
+        request_adapter = HttpxRequestAdapter(auth_provider, http_client=http_client, base_url="")
+    assert request_adapter.base_url == BASE_URL
 
 def test_httpx_request_adapter_uses_http_client_base_url(auth_provider):
     http_client = httpx.AsyncClient(base_url=BASE_URL)
-    request_adapter = HttpxRequestAdapter(auth_provider, http_client=http_client, base_url="https://no.com")
+    with warnings.catch_warnings():
+        warnings.simplefilter("error")
+        request_adapter = HttpxRequestAdapter(auth_provider, http_client=http_client)
     assert request_adapter.base_url == BASE_URL