Mozart Camargo Guarnieri (February 1, 1907 Tiete, Sao Paulo - January 13, 1993 Sao Paulo) was a Brazilian composer.
He studied piano and composition at the Sao Paulo Conservatorio, and subsequently worked with Charles Koechlin in Paris. Some of his compositions received important prizes in the United States in the 1940s, giving Guarnieri the opportunity of conducting them in New York, Boston, Los Angeles and Chicago. A distinguished figure of the Brazilian national school, he served in several capacities; conductor of the Sao Paulo Orchestra, member of the Academia Brasileira de Musica, and Director of the Sao Paulo Conservatorio, where he taught composition and orchestral conducting. In 1936 he was the first conductor of the Coral Paulistano choir. His oeuvre comprises symphonies, concertos, cantatas, two operas, chamber music, many piano pieces, and over fifty canciones.