Fiemme Valley (Italian: Val di Fiemme, German: Fleimstal) is a valley in the Trentino province, i.e. the southern half of the Trentino-Alto Adige/Südtirol region, in northern Italy, located in the Dolomites mountain region.

Val di Fiemme is a famous ski resort. There are a number of downhill skiing areas and a network of cross-country trails. In 1991, 2003 and 2013, the Nordic Skiing World Championships took place here. Cross-country skiing World Cup competitions are also held here regularly. Since 2007, Val di Fiemme has been the venue for the final two stages of the Tour de Ski series. Val di Fiemme and Val di Fassa are also home to the famous Marcialonga cross-country race.