Brigadier Martin Hotine CMG CBE (17 June 1898 – 12 November 1968) was the head of the Trigonometrical and Levelling Division of the Ordnance Survey responsible for the 26-year-long retriangulation of Great Britain (1936–1962) and was the first Director General of the Directorate of Overseas Surveys (1946–1985). He served on the North-West Frontier during the First World War and later in the Persian and Mesopotamian campaigns. He has been described as "decisive, ingenious and tough".