Castelcucco is a comune (municipality) in the Province of Treviso in the Italian region Veneto, located about 60 kilometres (37 mi) northwest of Venice and about 35 kilometres (22 mi) northwest of Treviso. As of 31 May 2021, it had a population of 2,288 and an area of 8.8 square kilometres (3.4 mi2).