Colonel Macbeth Duncan (1 September 1866 – 2 October 1942) was a Scotland international rugby union player.
He obtained his mathematics degree with honours before then studying law at both Aberdeen and Edinburgh universities.
He served an apprenticeship with Peter Duguid (advocate), Henry Peterkin (solicitor), and with the firm Mackenzie and Cormack in Edinburgh.
In the First World War he was sent to France as head of the 1st Highland Brigade (Royal Artillery).
He was decorated with a C. M. G.[16] In 1933, he was made a Honorary Colonel of the 75th Highland Field Brigade in the Royal Artillery (T.