Lawrence Mark Dundas, 4th Marquess of Zetland, DL (born 28 December 1937), less formally known as Mark Zetland, is a British hereditary peer, known before 1989 as Earl of Ronaldshay.
He was educated at Harrow School and Christ's College, Cambridge, and then joined the Grenadier Guards.
He is the elder brother of rock musician Lord David Dundas.
Lord Zetland was appointed a Deputy Lieutenant (DL) of the County of North Yorkshire on 6 May 1994.
Lord Zetland appeared as a contestant on the 4 August 1959 episode of To Tell the Truth.