Tramonti di Sotto (, locally ) is a (municipality) in the Regional decentralization entity of Pordenone, in the Italian region of Friuli-Venezia Giulia. It is located about northwest of Trieste and about northeast of Pordenone. As of 31 December 2004, it had a population of 444 and an area of .
Tramonti di Sotto borders the following municipalities: Castelnovo del Friuli, Clauzetto, Frisanco, Meduno, Preone, Socchieve, Tramonti di Sopra, Travesio, Verzegnis, Vito d'Asio.