Rex Julius (5 June 1914 – 19 May 1944) was an Australian official war artist of World War II. A commercial artist before the war, Julius enlisted in the Royal Australian Navy (RAN) in June 1940. He served overseas with the RAN and Royal Navy and was selected as the RAN's first official war artist in 1944 on the strength of drawings he had completed during his spare time. As an official war artist Julius prepared works in Sydney and on a corvette. He died of disease in May 1944.