Matthew Marsh (born 8 July 1954) is an English actor. He is the older brother of Jon Marsh of English dance band the Beloved. He has appeared in the films The Fourth Protocol (1987), Diamond Skulls (1989), Mountains of the Moon (1990), Alambrado (1991), Dirty Weekend (1993), Spy Game (2001), Miranda (2002), Bad Company (2002), Quicksand (2003) and An American Haunting (2005). In 2011 Marsh starred in the controversial film The Iron Lady as the United States Secretary of State Alexander Haig. In 2005 Marsh starred as Simon Hewitt in the first series of The Thick of It. In May 1998, Marsh portrayed the character Alex Duncan in the British TV program As Time Goes By, series 7, episode 3 entitled The New Neighbours. He has co-starred with Amanda Burton in The Commander, and guest-starred in the sixth series of the spy drama Spooks in 2007 and the second series of Lewis in 2008.

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