Trecastagni (Sicilian: Triccastagni) is a comune (municipality) in the Metropolitan City of Catania in the Italian region Sicily, located about 160 kilometres (99 mi) southeast of Palermo and about 11 kilometres (7 mi) north of Catania.

Trecastagni borders the following municipalities: Pedara, San Giovanni la Punta, Viagrande, Zafferana Etnea.