Carl Pontus Gahn (1 March 1759 – 9 May 1825) was a Swedish military officer who participated in the Russo-Swedish War in Finland in 1788–1789, the Finnish War campaign in Norway in 1808 and the unsuccessful invasion of Norway at Eidskog in 1814.[1] He was ennobled in 1809, taking the title Gahn af Colquhoun in acknowledgement of his Scottish ancestry (Gahn was itself a contraction via Cahun of the family name of Colquhoun).[2] He was promoted to the rank of Major General in 1814 and became president of the Court-Martial of Appeal in 1824.[1]