John Buchan, 1st Baron Tweedsmuir
- Born – 26 August 1875 in Perth, Scotland.
- Died – 11 February 1940 in Montreal, Quebec, Canada.
Governor-General of Canada, Member of Parliament for the Scottish Universities, High Commissioner to the General Assembly of the Church of Scotland, Chancellor of Edinburgh University (twice), journalist and war correspondent.
He was the author of a hundred books, including The Thirty-Nine Steps and Greenmantle.