Carl Einar Thure af Wirsén (20 April 1875 – 5 January 1946) was a Swedish Army officer, diplomat and writer.

Originally an officer, he was sent into the diplomatic service after World War I and served as a military attaché in Constantinople and Sofia where he witnessed the Armenian genocide.

[4] af Wirsén was acting first legation secretary in London from 28 April to 2 July 1921 and was appointed chargé d'affaires ad interim in Reval and Riga on 24 June 1921.

[7] af Wirsén served his mission in a very satisfactory manner, and skilfully preserved the integrity of the commission, including in relation to quite tangible British pressure.

On 1 February 1922 in Engelbrekt Church, Stockholm he married his cousin's daughter Ebba Elsa Cecilia Hildebrand (5 April 1903 – 26 September 1991; both in Stockholm), the daughter of chairman of the board of the Swedish National Debt Office, Karl Emil Hildebrand and Elisabet af Geijerstam.