First World War Major-General Sir John Humphrey Davidson, KCMG, CB, DSO (24 July 1876 – 11 December 1954), nicknamed "Tavish", was a British Army officer and Member of Parliament.

He was promoted to lieutenant on 15 October 1898, and a year later the Corps had been transferred to Cape Colony, where they were directly involved in the Second Boer War.

[3] After Haig became commander-in-chief (C-in-C) of the BEF on the Western Front, Davidson's star was in the ascendant as a part of Haig's inner circle and he was appointed to the post of director of military operations at the BEF's general headquarters (GHQ), one of the key posts controlling activities on the Western Front during the war.

Foch, concerned at the risk of a German attack in the French sector, refused, although he offered to participate in a joint Anglo-French offensive near Amiens.

He stood down from the Commons in 1931 to concentrate on his business interests, including a seat on the Vickers-Armstrongs board and a position as Chairman of the Bank of Australia between 1937 and 1945.

In the early 1950s he published the book 'Haig: Master of the Field, comprising a defence of the British Army General Headquarters' conduct of the Western Front campaign in 1917–1918.