Aarno Armas Sakari Yrjö-Koskinen (9 December 1885, Helsinki – 8 June 1951, Helsinki)[2] was a Finnish politician, Envoy and freiherr. He graduated as jurist and received the title varatuomari in 1915.
After the Finnish independence in 1917, Yrjö-Koskinen served under the Ministry for Foreign Affairs as Chief of political division from 1924 and Chief of staff from 1929. He worked as an Envoy in Moscow between 1 January 1931 and 8 April 1940.
^Turtola, Martti (1999). "Kansainvälinen kehitys Euroopassa ja Suomessa 1930-luvulla". In Leskinen, Jari; Juutilainen, Antti (eds.). Talvisodan pikkujättiläinen (in Finnish) (1st ed.). Werner Söderström Osakeyhtiö. pp. 13–46. ISBN951-0-23536-9.