Major A. L. Holt, MBE, MC (1896–1971) was a British military officer and explorer. In the 1920s while a member of the Royal Engineers, Holt led a number of motorized expeditions through the deserts of Arabia, the first time such long journeys had been undertaken with such a large number of vehicles. Holt traveled on occasion with St. John Philby and Gerard Leachman. In 1923 he proposed a route for a trans-Arabian railway which he had personally surveyed in 1922 by automobile. He writes, The railway was never built.