Brigadier Sir Gilbert Falkingham Clayton KCMG KBE CB (6 April 1875 – 11 September 1929), was a British army intelligence officer and colonial administrator, who worked in several countries in the Middle East in the early 20th century. In Egypt, during World War I as an intelligence officer, he supervised those who worked to start the Arab Revolt. In Palestine, Arabia and Mesopotamia, in the 1920s as a colonial administrator, he helped negotiate the borders of the countries that later became Israel, Jordan, Syria, Saudi Arabia and Iraq.
Clayton become an officer in the Royal Artillery in 1895. He was part of the forces sent to the Sudan during the closing stages of the Mahdist War, seeing action in the Battle of Atbara (1898). He then served in Egypt, but in 1910 he retired and left the army to work as private secretary to the Governor-General of Sudan, Sir Francis Reginald Wingate. In 1912, he married Enid Caroline Thorowgood in London, with the ceremony being conducted by the Bishop of Khartoum.
During World War I, Clayton worked in army intelligence in Cairo, Egypt, serving in the newly formed Arab Bureau. In 1914, he sent a secret memorandum to Lord Kitchener, suggesting that Britain work with the Arabs to overthrow their Ottoman rulers. He became Director of Intelligence, and was promoted Brigadier-General. In this role, he worked with many of the people that helped to trigger the Arab Revolt against the Ottoman Turks.