Altrei ([altraɪ̯], Italian Anterivo) is a municipality with 395 inhabitants (as of 31 December 2015) in South Tyrol (Italy). It lies about the same distance from Bolzano and Trento in Val di Fiemme. Altrei is the only German-speaking community in the Fiemme Valley, which is otherwise Italian-speaking and belongs to Trentino.