Giuseppe Guglielmo Umberto Caselli (July 5, 1893 – December 19, 1976) was an Italian painter. He studied under Felice Del Santo and Antonio Discovolo. In 1913, Caselli was imprisoned in a concentration camp in Austria. After that, he studied at the Academy of Fine Arts in Florence. In 1938 he participated in the "Premio del Golfo (Gulf Award)", organized by Filippo Tommaso Marinetti.