General Sir Frank Ernest Wallace Simpson, GBE, KCB, DSO (21 March 1899 – 28 July 1986) was a senior British Army officer during the 1940s.

Born on 21 March 1899, Simpson was educated at Bishop Cotton Boys' School,[1] Bedford School, Trinity Hall, Cambridge, and at the Royal Military Academy, Woolwich.

[4][5] Simpson also served in the Second World War, initially in France and Belgium with the British Expeditionary Force and was involved in the defence of Arras and then the Dunkirk evacuation in 1940.

[4] He became chief of staff to Lieutenant General Bernard Montgomery in 1940 and then deputy director of Military Operations at the War Office in 1942 being promoted to Director of Military Operations in 1943.

[8] He was a deputy lieutenant for Essex from 1956[9] and was Governor of the Royal Hospital Chelsea from 1961[10] to 1969.