William Baylebridge (12 December 1883 – 7 May 1942), born Charles William Blocksidge, was an Australian writer, poet, and political theorist. Baylebridge was born in Brisbane, Queensland, the son of George Henry Blocksidge. He studied at Brisbane Grammar School, then under a private tutor, the classicist David Owen. Baylebridge died on 7 May 1942. He is buried in South Head Cemetery. He never married and had no children.