Alexander Arthur Fraser, 20th Lord Saltoun MC JP DL (8 March 1886 – 31 August 1979), styled Master of Saltoun until 1933, was a Scottish peer who was one of the longest-serving representative peers, serving from 1935–63. He was the eldest son of Alexander Fraser, 19th Lord Saltoun and Mary Helena Grattan-Bellew, sister of Sir Henry Christopher Grattan-Bellew, 3rd Baronet. He was educated at Eton College and New College, Oxford. He was a Captain and Hon. Major in the Gordon Highlanders in WWI, when he was taken prisoner of war. He died at Cross Deep, his home in Twickenham, aged 93.