The Mocheni Valley (Italian: Valle dei Mòcheni, German: Fersental, Mócheno: Bersntol), also known as Fersina Valley from the name of the torrent Fersina, is a valley in Trentino.
The valley is a language island of the Mócheno language, an Upper German variety.
Some of the municipalities in the valley are Fierozzo, Frassilongo, Palù del Fersina (in which the majority of people declared themselves members of the Mòcheno linguistic group) and Sant'Orsola Terme.