"Jack" Zivic (June 23, 1903 – May 22, 1973) was an American boxer who competed in the featherweight class in the 1920 Summer Olympics in Antwerp.
He was a serious contender for the world lightweight championship in 1924, but was defeated by reigning junior lightweight champion Jack Bernstein in an elimination tournament.
He had a solid punch and was known for his left hook.