Antony Claud Frederick Lambton (10 July 1922 – 30 December 2006), briefly 6th Earl of Durham, styled before 1970 as Viscount Lambton, and widely known as "Lord Lambton", was a Conservative Member of Parliament and a cousin of Sir Alec Douglas-Home, the former Prime Minister and Foreign Secretary. Lambton resigned from Parliament and ministerial office in 1973.

Lambton grew up on the family estates centred on Lambton Castle near Washington in County Durham, actually living at the nearby Biddick Hall. He was educated at Harrow School and served for a period in the Hampshire Regiment during the Second World War, before being invalided out. He then did war work in a Wallsend factory. Lambton married Belinda (Bindy) Blew-Jones (1921–2003) in 1942. They had five daughters including Lucinda (the writer and architectural commentator) and Anne (an actress), and one son, Ned (who fought Berwick-upon-Tweed for the Referendum Party at the 1997 General Election).

Lambton first stood for Parliament at the 1945 general election in the safe Labour seat of Chester-le-Street, then Bishop Auckland in 1950. He was elected to Durham City Council and to Durham County Council in 1947, serving for two years. He was elected Member of Parliament for Berwick-upon-Tweed in 1951 where he served until 1973.