Stupnica (river)
{{Expand Polish|topic=geo|date=October 2011|Stupnica}}
{{Infobox river
| name = Stupnica
| name_other =
| image = PowodzBircza20092.JPG
| image_caption =
| image_size =
| source1_location =
| source1_coordinates=
| mouth_location = San
| mouth_coordinates = {{coord|49|46|50|N|22|28|57|E|region:PL_type:landmark_source:kolossus-plwiki|display=it}}
| progression = {{RSan}}
| subdivision_type1 = Country
| subdivision_name1 = Poland
| length =
| source1_elevation =
| discharge1_avg =
| basin_size =
}}
Stupnica is a right tributary of the San River in southeastern Poland. Its length is roughly 28 kilometres. It joins the San near Bachów.