There have been two baronetcies created for persons with the surname Buchanan, both in the Baronetage of the United Kingdom.
His son, the fourth Baronet, was a Justice of the Peace, Deputy Lieutenant and High Sheriff for Nottinghamshire.
Sir George Buchanan, fourth son of the first Baronet, was also a noted diplomat.
The Buchanan Baronetcy, of Lavington in the County of Sussex, was created in the Baronetage of the United Kingdom on 6 February 1920.
The heir apparent is the present holder's son George Charles Mellish Buchanan (born 1975).