Antonio "Toto" Cotogni (Italian pronunciation: [anˈtɔːnjo ˈtɔːto koˈtoɲi]; August 1, 1831 – October 15, 1918) was an Italian baritone of the first magnitude. Regarded internationally as being one of the greatest male opera singers of the 19th century, he was particularly admired by the composer Giuseppe Verdi. Cotogni forged an important second career as a singing teacher after his retirement from the stage in 1894.