Dominic Cossa (born May 13, 1935) is an American operatic lyric baritone particularly associated with the Italian and French repertoire.
Born in Jessup, Pennsylvania, Cossa studied with Anthony Marlowe in Detroit, Michigan, Robert Weede in Concord, California, and Armen Boyajian in New York City. He made his debut at the New York City Opera as Moralès in 1961, and a week later sang Sharpless with the company. He won the American Opera Auditions in 1964 and was sent to Italy for debuts at the Teatro Nuovo in Milan and Teatro della Pergola in Florence.
He made his debut at the San Francisco Opera in 1967 as Zurga in Les pêcheurs de perles. His Metropolitan Opera debut took place on January 30, 1970 as Silvio in Pagliacci. Other roles there were Figaro in Il barbiere di Siviglia, Lescaut in Manon Lescaut, Marcello in La bohème, Mercutio in Romeo and Juliette, Masetto in Don Giovanni, Valentin in Faust, Yeletsky in Pique Dame, Germont in La traviata, and Albert in Werther. In 1976 he created the role of David Murphy in the world premiere of Gian Carlo Menotti's The Hero with the Opera Company of Philadelphia.