Aci Castello is a comune located in the Metropolitan City of Catania in Sicily, Italy. It is situated on the Mediterranean coast, approximately 9 kilometres (6 miles) north of the city of Catania.
The primary economic sectors of the municipality are agriculture and industry. Aci Castello is bordered by several neighboring areas, including Aci Catena, Acireale, Catania, San Gregorio di Catania, and Valverde.