Alexander Hugh Macmillan (June 2, 1877 – August 26, 1966), also referred to as A. H. Macmillan, was an important member of the Bible Students, and later, of Jehovah’s Witnesses. He became a board member of the Watch Tower Bible and Tract Society in 1918. He presented a history of the religious movement in his book Faith on the March, published in 1957.