John Flanagan is an Australian fantasy author. He lives in Sydney, Australia with his wife. His best known work is the Ranger's Apprentice novel series, which is about a boy named Will who is taken as an apprentice Ranger to the grim and mysterious Halt.

Prior to becoming a novelist, John Flanagan did advertising and television commercials. He co-created the television series Hey Dad! He originally wrote the books for his son, to encourage him to read.