Major General Gilbert Savil Szlumper, CBE, TD (18 April 1884 – 19 July 1969) was a British railwayman, and the penultimate general manager of the Southern Railway. He left the Southern Railway for war service in 1939, becoming director-general of transportation & movements, War Office (1939–1940); railway control officer, Ministry of Transport (1940–1941) and director-general of supply services, Ministry of Supply (1942–1945).