Julia is a surname. Notable people with the surname include:
Bernard Julia (born 1952), French physicist Cassie Julia, American politician Charles H. Juliá (1908–1979), Puerto Rican senator Denise Julia (born 2002), Filipino singer Didier Julia (born 1934), French politician Dominique Julia (born 1940), French historian Gaston Julia (1893–1978), French mathematician Javier Julia, Argentine cinematographer and film editor José Julia (born 1979), Spanish cyclist Martha Julia (born 1973), Mexican actress Raúl Juliá (1940–1994), Puerto Rican actor