Among the approximately one million foreign volunteers and conscripts who served in the Wehrmacht during World War II were ethnic Belgians, Czechs, Dutch, Finns, Danes, French, Hungarians, Norwegians, Poles, Portuguese, Swedes, Swiss along with people from Great Britain, Ireland, Estonia, Latvia, Lithuania, and the Balkans. At least 47,000 Spaniards served in the Blue Division.
Many Soviet citizens (Russians and other non-Russian ethnic minorities) joined the Wehrmacht forces as Hiwis (or Hilfswillige). The Ukrainian collaborationist forces were composed of an estimated number of 180,000 volunteers serving with units scattered all over Europe. Russian émigrés and defectors from the Soviet Union participated in the formation the Russian Liberation Army. Thousands of White exiles also fought and served within German units of the Wehrmacht both on the Eastern Front and in Europe. Non-Russians from the Soviet Union formed the Ostlegionen (literally "Eastern Legions"). The East Legions comprized a total of 175,000 personnel. These units were all commanded by General Ernst August Köstring (1876−1953). A lower estimate for the total number of foreign volunteers that served in the entire German armed forces (including the Waffen SS) is 350,000.