Lieutenant Colonel Sir Arthur Henry McMahon, GCMG, GCVO, KCIE, CSI, KStJ (28 November 1862 Simla, British India — 29 December 1949 London, United Kingdom), was a British diplomat and Indian Army officer who served as the High Commissioner in Egypt from 1915 to 1917. He was also an administrator in British India, and served twice as Chief Commissioner of Balochistan. McMahon is best known for the McMahon-Hussein Correspondence, as well as the McMahon Line between Tibet and India. He also features prominently in T.E. Lawrence's account of his role in the Arab Revolt against the Ottoman Empire during World War I, Seven Pillars of Wisdom. He is usually known as Sir Henry McMahon.