Hartley William Shawcross, Baron Shawcross, (4 February 1902 – 10 July 2003), known from 1945 to 1959 as Sir Hartley Shawcross, was an English barrister and Labour politician who served as the lead British prosecutor at the Nuremberg War Crimes tribunal. He also served as Britain's principal delegate to the United Nations immediately after World War II and as Attorney General for England and Wales.