Sir Allan Stephen Quartermaine, CBE, MC (9 November 1888 – 17 October 1978) was a British civil engineer. He started his career in the Hertfordshire county surveyor's office and served in the Royal Engineers during the First World War, constructing railways in the Middle East and being awarded the Military Cross. After the war he continued to work for local authorities before joining the Great Western Railway (GWR), where he became chief engineer by 1940. During the Second World War he served as Director-General of Aircraft Production Factories before returning to the GWR to construct military railway facilities. After the war he refused a position on the Railway Executive of the British Transport Commission as he disagreed with nationalisation of the railways. Despite this he transferred