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John Macnab is a novel by John Buchan, published in 1925.

Three successful but bored friends in their mid-forties decide to turn to poaching. They are Sir Edward Leithen, lawyer, Tory Member of Parliament (MP), and ex-Attorney General; John Palliser-Yeates, banker and sportsman; and Charles, Earl of Lamancha, former adventurer and present Tory Cabinet Minister. Under the collective name of 'John Macnab', they set up in the Highland home of Sir Archie Roylance, a disabled war hero who wishes to be a Conservative MP.

They issue a challenge to three of Roylance’s neighbours: first the Radens, who are an old-established family, about to die out; next, the Bandicotts: an American archaeologist and his son, who are renting a grand estate for the summer; and lastly the Claybodys, vulgar, bekilted nouveaux riches. These neighbours are forewarned that 'John Macnab' will poach a salmon or a stag from their land and return it to them undetected.

Sir Edward Leithen is a fictional character in several of John Buchan's novels: The Power-House (1916), John Macnab (1925), The Dancing Floor (1926), The Gap in the Curtain (1932) and Sick Heart River (1941), one year after Buchan's death. Leithen's name is borrowed from the Leithen Water, a tributary of the River Tweed, one of many references to the Scottish Borders in Buchan's novels.

John Buchan, 1st Baron Tweedsmuir PC GCMG GCVO CH (26 August 1875 – 11 February 1940) was a Scottish novelist, historian and Unionist politician who served as Governor General of Canada, the 15th since Canadian Confederation.

After a brief legal career Buchan simultaneously began both his writing career and his political and diplomatic career, serving as a private secretary to the colonial administrator of various colonies in Southern Africa. He eventually wrote propaganda for the British war effort in the First World War. Once he was back in civilian life Buchan was elected Member of Parliament for the Combined Scottish Universities, but he spent most of his time on his writing career, notably writing The Thirty-Nine Steps and other adventure fiction.