Castello-Molina di Fiemme (Castèl e Molina in local dialect) is a comune (municipality) in Trentino in the northern Italian region Trentino-Alto Adige/Südtirol, located about northeast of Trento. As of 31 December 2004, it had a population of 2,172 and an area of .
The municipality of Castello-Molina di Fiemme contains the frazioni (subdivisions, mainly villages and hamlets) Predaia and Stramentizzo.
Castello-Molina di Fiemme borders the following municipalities: Carano, Cavalese, Altrei, Valfloriana, Pieve Tesino and Telve.