Auguste "Gus" Deloof (September 26, 1909 in Brussels – May 8, 1974 in Brussels) was a Belgian jazz trumpeter, composer, and arranger.. Deloof began playing professionally in 1926 and was a member of the group The Michigans in 1927.
He worked in Monte Carlo in 1928–1929 with some of Chas Remue's sidemen, then joined Fud Candrix's Carolina Stomp Chasers.
He also performed with Spike Hughes, Bernard Ette, and Willie Lewis.
In 1934, he moved to France to join Ray Ventura's group, where he remained until 1939.
He did recording sessions in the late 1930s with Philippe Brun and Quintette du Hot Club de France.