Very Rev Dr Robert Buchanan DD (1802–1875) was a 19th century Scottish minister and historian who served as Moderator of the General Assembly to the Free Church of Scotland in 1860/61.
He was one of the leading figures in the Disruption of 1843.
He had correspondence with several notable figures of the day over many years: Lord Aberdeen; Sir Robert Peel; Thomas Chalmers from 1834 to 1845; and George Combe from 1821 to 1827.