Castelfondo was a municipality located in the Trentino province of the northern Italian region of Trentino-Alto Adige/Südtirol. It was situated approximately 45 kilometres (28 mi) north of the city of Trento.
On 1 January 2020, Castelfondo ceased to exist as an independent municipality. It merged with the municipalities of Fondo and Malosco to form the new comune of Borgo d'Anaunia.