Rowland Denys Guy Winn, 4th Baron St Oswald,[1] MC, DL (19 September 1916 – 19 December 1984), was a British soldier and Conservative politician.
He was a major in the 8th King's Royal Irish Hussars and served in the Middle East from 1940 to 1944 and South-East Asia from 1944 to 1945 in the Second World War, where he was wounded and mentioned in dispatches.
St Oswald succeeded his father in the barony in 1957 and took his seat on the Conservative benches in the House of Lords.
He served under Harold Macmillan and Sir Alec Douglas-Home as a Lord-in-waiting (government whip in the House of Lords) from 1959 to 1962 and as Joint Parliamentary Secretary to the Ministry of Agriculture, Fisheries and Food from 1962 to 1964.
Lord St Oswald married firstly Laurian, daughter of Sir Roderick Jones, in 1952.