Mackenzie Crook (born September 29, 1971) is an English actor best known for playing Gareth Keenan in The Office.
Crook was born in Maidstone, Kent. He appeared in Pirates of the Caribbean (2003) as Ragetti, a pirate with a wooden eye. He also appeared in Michael Radford's 2004 film adaptation of William Shakespeare's The Merchant of Venice, playing the role of Launcelot Gobbo. Crook also played a minor role in 2004's Finding Neverland as a theatre usher. He played Billy Bibbit in the 2004 London West End production of the stage play of One Flew Over the Cuckoo's Nest.