Piazza Armerina (Sicilian: Ciazza) is an Italian Comune in the province of Enna of the autonomous island region of Sicily.

The city of Piazza (as it was called before 1862) began during the Norman domination in Sicily (11th century), but the area was inhabited since prehistorical times. The city was flourishing also during Roman times, as showed by the notable examples of the patrician Villa Romana del Casale.

The town is mainly famous for its Roman mosaics.