Lieutenant General Sir Reginald Francis Stewart Denning, KCVO, KBE, CB (12 June 1894 – 23 May 1990) was a British Army staff officer and administrator.

He joined the British Army at the beginning of the First World War as a private with the Queen's Westminsters, and was sent to serve on the Western Front in 1914, where he was posted to Ypres.

A corporal from his company picked him up and carried him to a field ambulance, and after surgery he was shipped back to England, where a metal plate was put in his head.

He was promoted to major general in 1943 to lead the planning for D-Day; he asked to be demoted to brigadier so he would be allowed to take part in the landings themselves, but this request was denied.

[8] After the success of the operation he was posted to Far East Command and became Chief Administrative Officer for the south-east Asian campaign.