Sir Arnold Henry Moore Lunn (18 April 1888 – 2 June 1974) was a British skier, mountaineer and writer. He was knighted for "services to British Skiing and Anglo-Swiss relations" in 1952. His father was a lay Methodist minister, but Lunn was an agnostic and wrote critically about Catholicism before he converted to that religion at the age of 45 and became an apologist.