Robert Houghwout Jackson (February 13, 1892 – October 9, 1954) was an American attorney and judge who served as an Associate Justice of the United States Supreme Court. He had previously served as United States Solicitor General and United States Attorney General, and is the only person to have held all three of those offices. Jackson was also notable for his work as Chief United States Prosecutor at the Nuremberg trials of Nazi war criminals following World War II.