Michael John Hicks Beach, 2nd Earl St Aldwyn GBE TD PC DL (9 October 1912 – 29 January 1992) was a British Conservative politician. He achieved the distinction of serving in the governments of five different prime ministers.

St Aldwyn was born at Sudeley Castle in 1912, the only son of Michael Hicks Beach, Viscount Quenington, and the grandson of Michael Hicks Beach, 1st Earl St Aldwyn.^[1] His mother was Marjorie Brocklehurst was the daughter of Henry Dent Brocklehurst. Across March and April 1916, both his parents and his grandfather died in rapid succession: his mother died on 4 March, his father was killed in action on 23 April, and his grandfather died on 30 April.^[1] He succeeded his grandfather in the earldom, aged only three.^[1] St Aldwyn was educated at Eton and later fought in the Second World War as a Major in the 1st Royal Gloucestershire Hussars.^[1]

In 1954 St Aldwyn was appointed Joint Parliamentary Secretary to the Ministry of Agriculture and Fisheries in the Conservative administration of Winston Churchill, a post he also held under Anthony Eden and Harold Macmillan (the ministry was renamed the Ministry of Agriculture, Fisheries and Food in 1955).^[1]

In 1958 Macmillan promoted him to Captain of the Honourable Corps of Gentlemen-at-Arms (chief government whip in the House of Lords).^[1] He retained this post also under Sir Alec Douglas-Home from 1963 to 1964. After the Conservatives lost power in 1964 he served as Chief Opposition Whip in the House of Lords from 1964 to 1970. When the Conservatives returned to power in 1970 under Edward Heath, St Aldwyn was again appointed Captain of the Honourable Corps of Gentlemen-at-Arms, which he remained until the government fell in 1974.^[1]

Between 1974 and 1977 he was again Chief Opposition Whip in the House of Lords.^[1] Apart from his political career he was also a Justice of the Peace and Deputy Lieutenant of Gloucestershire and served as Vice Lord-Lieutenant of Gloucestershire from 1981 to 1987. He was sworn of the Privy Council in 1959, appointed a KBE in 1964 and a GBE in 1980.^[1]

Lord St Aldwyn married Diana Mary Christian Mills, daughter of Henry Christian George Mills, on 26 June 1948. They had three sons:^[2]

• Michael Henry Hicks-Beach, 3rd Earl St Aldwyn (born 7 February 1950).
• Hon Peter Hugh Hicks-Beach (born 31 May 1952).
• Hon David Seymour Hicks-Beach (born 25 May 1955).

On 29 January 1992, Lord St Aldwyn died at his home in Coln St. Aldwyns from heart disease and colorectal cancer. He was succeeded by his eldest son Michael.^[1]