Cantiere navale di Riva Trigoso is an Italian shipyard. Founded on 1 August 1897 by Erasmo Piaggio's Società Esercizio Bacini in Riva Trigoso, it mostly built commercial ships. In 1925 the Piaggio heirs decided to spin off the drydock business and the company was renamed Cantieri del Tirreno. It diversified into building warships and was heavily damaged during World War II.