Carlo Felice Cillario (7 February 1915 – 13 December 2007) was an Argentinian-born Italian conductor of international renown.
Born Carlos Felix Cillario in San Rafael, Mendoza, Argentina, he went to Italy in 1923, where he studied the violin and composition at the Bologna Conservatorio. He hoped to become a soloist but a wrist injury playing soccer made him turn to conducting. He made his conducting debut in 1942 in Odessa. During the war, he returned to Argentina, where he conducted the Symphonic Orchestra of the University of Tucuman.
Upon his return to Italy, he founded the Bologna Chamber Orchestra in 1946, and reserved a major portion of his time to opera, conducting at the opera houses of Rome, Turin, Florence, Milan, etc. He quickly began appearing outside Italy, notably in Athens, Berlin, Oslo and Paris.
The year 1961 saw his debuts in England, at the Glyndebourne Festival in L'elisir d'amore, and in the United States, at the Lyric Opera of Chicago in La Forza del Destino, later conducting The Barber of Seville, La Cenerentola, La favorite and La bohème. In 1964, he made his debut at the Royal Opera House in London at the request of Maria Callas, conducting her now famous series of Tosca performances with Tito Gobbi. Debuts at the San Francisco Opera followed in 1970 (Tosca) and at the Metropolitan Opera in New York in 1972 (La sonnambula).