Forni di Sotto is a comune located in the Friuli-Venezia Giulia region of northeastern Italy. It belongs to the regional decentralization entity of Udine and is situated approximately 60 kilometres northwest of Udine and 120 kilometres northwest of Trieste.
The municipality covers a total area of 93.0 square kilometres. As of December 31, 2004, Forni di Sotto had a recorded population of 701 residents.