William Barrington may refer to:
William Barrington (English politician), English MP for St Germans 1588–1589 William Barrington, 2nd Viscount Barrington (1717–1793), British MP for Berwick and for Plymouth, Secretary at War and Chancellor of the Exchequer William Barrington, 6th Viscount Barrington (1793–1867), British MP for Berkshire, chairman of Great Western Railway William Barrington (diplomat) (1842–1922), his son, British Ambassador to Argentine and Sweden William Barrington (Irish politician) (1857–1937), Irish Member of the Seanad Éireann 1922–1931
See also William Barrington-Coupe (1931–2014), British record producer