Colonel John Douglas Slim, 2nd Viscount Slim OBE, DL, FRGS (born 20 July 1927) is a British peer and soldier. He is one of the 92 hereditary peers in the House of Lords, elected to remain after the passing of the House of Lords Act 1999. In 1970, he succeeded to his father's title. He sits as a crossbencher. Since 1958, he has been married to Elisabeth Spinney. They have two sons, including his heir apparent Mark William Rawdon Slim, and one daughter.