Carlo Felice Cillario, born Carlos Felix Cillario on February 7, 1915, in San Rafael, Mendoza, Argentina, was an Italian conductor. He studied violin with Angelo Consolini and composition with Cesare Nordio at the G.B. Martini Conservatory of Bologna, graduating in 1932 with the Tonolla Prize. After a wrist injury in 1943 during a football match in Odessa, Cillario began conducting, debuting with Il Barbiere di Siviglia in Odessa in 1942. His operatic debut in Italy was at the Teatro Comunale in Bologna with La dama di picche in 1957. He conducted extensively across Europe, the Americas, and Australia, notably at the Glyndebourne Festival Opera in 1961 (L'elisir d'amore) and the Royal Opera House in London in 1964, where he conducted Maria Callas in Tosca. Cillario collaborated with leading artists such as Luciano Pavarotti and Montserrat Caballé, persuading Caballé to sing bel canto repertoire. His career spanned over six decades until his death on December 13, 2007.