The Fassa Valley (Ladin: Fascia, Italian: Val di Fassa, German: Fassatal) is a valley in the Dolomites in Trentino, northern Italy. The valley composes an administrative valley community (Italian: Comunità di valle, German: Talgemeinschaft) of Trentino, known as Fascia (Italian: Region Comun General de Fascia).
The valley is home to much of the Ladin community in Trentino, which makes up the majority of the valley's population.