Joseph Smith Fletcher (7 February 1863 - 30 January 1935) was a British journalist and writer. He wrote about 200 books on a wide variety of subjects, both fiction and non-fiction. He was one of the leading writers of detective fiction in the "Golden Age".
Fletcher was born in Halifax, West Yorkshire, son of a clergyman. He was educated at Silcoates School in Wakefield. After some study of law, he became a journalist. His first books published were poetry, and he then moved on to write numerous works of both historical fiction and history, many dealing with Yorkshire. He was made a fellow of the Royal Historical Society. In 1914 he wrote his first detective novel and went on to write over a hundred, latterly featuring private investigator, Ronald Camberwell.