Orpen is an Anglo-Norman toponymic surname deriving from "Erpen". It may refer to:Abe Orpen (1854–1937), Canadian horse-racing track owner and casino operator, cousin of William Bea Orpen (1913–1980), Irish painter Charles Orpen (1791–1856), Irish physician, writer and clergyman Goddard Henry Orpen (1852–1932), Irish historian John Orpen (1868–1950), Anglican clergyman Joseph Orpen (1828–1923), British colonial administrator Raymond Orpen (1837–1930), Irish clergyman William Orpen (1871–1931), Irish portrait painter