Bagni San Filippo is an area in the municipality of Castiglione d'Orcia in the Province of Siena, Italy, not far from Monte Amiata. It is a small hot spring containing calcium carbonate deposits, which form white concretions and waterfalls. The name derives from that of St Philip Benizi, who was a prior of the Servite order, and who lived as a hermit here in the thirteenth century. The grotto is open to visitors.

• Bagni San Filippo The website contains info about Bagni San Filippo Thermal SPA and more
• bagnisanfilippo.eu Archived 2012-09-03 at the Wayback Machine The best website for Bagni San Filippo -Tourism - SPA - Hotels - Restaurants - Map - Info - links- weather forecast
• Official Tourism site for Bagni San Filippo
• Tourism in San Filippo

42°55′48″N 11°42′05″E / 42.93000°N 11.70139°E / 42.93000; 11.70139