CHAUNY, a town of northern France in the department of Aisne, 19 m. S. by W. of St. Quentin by rail. Pop. The town is situated on the Oise (which here becomes navigable) and at the junction of the canal of St. Quentin with the lateral canal of the Oise. It contains mirror-polishing works, chemical works and metal foundries. It was the scene of much fighting in the Hundred Years' War.