Mario Sironi (May 12, 1885 - August 13, 1961) was an Italian modernist artist who was active as a painter, sculptor, illustrator, and designer.

Born in Sassari on the island of Sardinia, Sironi spent his childhood in Rome. He embarked on the study of engineering at the University of Rome but quit after a nervous breakdown in 1903, one of many severe depressions that would recur throughout his life. Thereafter he dedicated himself to painting, and attended the Scuola Libera del Nudo at the Accademia di Belle Arti di Roma, where he met Giacomo Balla, Gino Severini and Umberto Boccioni. These artists, who would later become the leading Futurists*, were then painting in a Neo-Impressionist* style. Sironi's development c...