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. From the Ottoman Empire and the Balkans, af Wirsén came to Poland and witnessed the country's resurrection. After serving in London, Reval and Riga, he was sent as envoy to Bucharest, Athens and Belgrade in 1921. After working in the Mosul Commission, af Wirsén was sent to Berlin, where he would stay for the next 12 years as envoy. Finally he was envoy in Rome for three years before retiring in 1940.