Sir William Stephen Ian Whitelaw, 1st Viscount Whitelaw, KT, CH, MC, PC, DL (June 28, 1918 - July 1, 1999) was a British Conservative politician.
Whitelaw attended Trinity College, Cambridge, then joined the British Army, earning the rank of major in the Scots Guards; during World War II, he earned a Military Cross. He became MP for Penrith and the Border in 1955, and represented that constituency for 28 years. He became Opposition Chief Whip in 1964, and then Lord President of the Council and Leader of the House of Commons in 1970. He was also appointed to the Privy Council during this time.
He was the first British Secretary of State for Northern Ireland after the imposition of direct rule in March 1972 and he served in that capacity until November 1973. During his time in Northern Ireland he introduced 'special category' status for paramilitary prisoners. He also served as Secretary of State for Employment from 1973 to 1974; in the latter year, he became a Companion of Honour.
Soon after Harold Wilson took control of the government, Whitelaw became Deputy Leader of the Opposition, a position he held until Margaret Thatcher became prime minister. In 1979, he became Home Secretary and Deputy Prime Minister. In 1983, he received a life peerage on 11 June 1983, becoming Lord President and Leader of the House of Lords. He had actually been returned as MP for Penrith in the 1983 general election but was elevated to the peerage just two days later, sparking an immediate by-election.
| Preceded by: Fred Peart | Lord President of the Council 1970-1972 | Followed by: Leonard Robert Carr |
| Preceded by: --- | Secretary of State for Northern Ireland 1972-1973 | Followed by: Francis Pym |
| Preceded by: Maurice Macmillan | Secretary of State for Employment 1973-1974 | Followed by: Michael Foot |
| Preceded by: Merlyn Rees | Home Secretary 1979-1983 | Followed by: Leon Brittan |
| Preceded by: John Biffen | Lord President of the Council 1983-1988 | Followed by: John Wakeham |
| Preceded by: New Creation | Viscount Whitelaw | Followed by: Extinct |