Archibald Sinclair (11 January 1866–1922) was a British journalist who wrote primarily on sports, particularly swimming.
[1] With William Henry, he administered the Swimmer's Life Saving Society, founded in London in 1893.
[2] Sinclair was educated at St Mark's College, Chelsea, London.
He was the sports editor for The Morning (a London newspaper published from 1892 to 1898) and was on the staff of The Sportsman for several years.
[2] With William Henry, he wrote a book on swimming for the Badminton Library.