Janet Gladys Aitken, later Campbell, Montagu, and Kidd, (9 July 1908 – 18 November 1988) was a Canadian-British aristocrat and socialite. The daughter of Max Aitken, 1st Baron Beaverbrook, she grew up at Cherkley Court in Surrey. She was the first wife of Ian Campbell, later the Duke of Argyll, and the mother of Lady Jeanne Campbell. Her second husband, who was a son of the 9th Earl of Sandwich, died in World War II. She married a third time to the Canadian army officer Major Thomas Edward Dealtry Kidd.