特威兹穆尔男爵（Baron Tweedsmuir）是英国贵族头衔，封于1935年。

Baron Tweedsmuir, of Elsfield in the County of Oxford, is a title in the Peerage of the United Kingdom. It was created in 1935 for the author and Unionist politician John Buchan. He served as Governor-General of Canada from 1935 to his death in 1940. His eldest son, the second Baron, was the husband of the Conservative politician Lady Tweedsmuir. As of 2010 the title is held by the second Baron's nephew, the fourth Baron, who succeeded his father in 2008.