Acqui (anc. Aquae Statiellae), a town of Italy, capital of a district of the same name, in the Piedmontese province of Alessandria, on the left bank of the Bormida, 18 m. S. of Alessandria; pop. about 9,000. It is much frequented by invalids for its famous hot sulphur springs, which were well known to the ancient Romans. The remains of a Roman aqueduct are among its curiosities. It contains many handsome buildings, among them a cathedral, convents, a college, and a theological seminary.