John Keith Patrick Allen (17 March 1927 – 28 July 2006) was a British film, television and voice actor.
Allen was born in Nyasaland (now Malawi), where his father was a tobacco farmer. After his parents returned to Britain, he was evacuated to Canada during World War II where he remained to finish his education at McGill University in Montreal. He gained experience as a local radio broadcaster and appeared on television in plays and documentaries, before returning to Britain.
Returning to England in 1953, Allen made his film debut in Hitchcock's Dial M for Murder (1954). He subsequently appeared in character roles in many films, including Captain Clegg, The Wild Geese, The Sea Wolves and Who Dares Wins. He was also lead actor in the ITV mid-1960s adventure series Crane. Took the lead role in the 1971 BBC-1 series Brett. Allen played Moriaty's deputy Colonel Sebastian Moran in The Adventures of Sherlock Holmes and The Return of Sherlock Holmes.
He made regular appearances in ITC television series during the 1960s and early 1970s, including The Baron, The Champions and UFO, although he never had an ongoing role in any of these series.
Allen also worked with the Royal Shakespeare