Duncan William Ferguson Lamont (17 June 1918 – 19 December 1978) was a British actor. Born in Lisbon, Portugal, but brought up in Scotland, he had a long and successful career in film and television, appearing in a variety of high-profile productions. On film, the best-known of the many productions he appeared in were The 39 Steps (1959, as Kennedy), Ben-Hur (1959, uncredited but playing Marius), Mutiny on the Bounty (1962, as John Williams), Arabesque (1966) and Battle of Britain (1969, as Flight Sergeant Arthur). Lamont is particularly memorable in his role as the wry, urbane Viceroy in Jean Renoir's The Golden Coach. On television, he was a semi-regular in the series The Texan from 1958 to 1960, and appeared in guest roles in a range of popular British programmes from the 1950s to the 1970s, including The Adventures of Robin Hood, Dixon of Dock Green, Danger Man, The Avengers, Randall and Hopkirk (Deceased), The Persuaders!, and Doctor Who (the story Death to the Daleks).