William Crichton, 1st Lord Crichton of Sanquhar (died 1450s) was an important political figure in Scotland.
He held various positions within the court of James I. At the death of James I, William Crichton was Sheriff of Edinburgh, Keeper of Edinburgh Castle, and Master of the King’s household. In 1439 he became Chancellor of Scotland.
In James II’s minority, Archibald Douglas, 5th Earl of Douglas was Regent. At his death William Crichton and Sir Alexander Livingston fought to overthrow the power of the Black Douglas family. In 1440 they invited the 16-year-old William Douglas, 6th Earl of Douglas and his brother to dinner in Edinburgh Castle, and killed them. This incident has become known as the ‘Black Dinner’.
In 1450 he made a considerable loan to James II. He also invested his wealth in Crichton Castle, adding to it and transforming it into an impressive courtyard castle.
He is the villain of the story in Black Douglas, a novel by Nigel Tranter.