Quisling entered the army in 1911 and served as military attaché in Petrograd (St. Petersburg; 1918–19) and in Helsinki (1919–21). He assisted in relief work in Russia under the famous Arctic explorer and humanitarian Fridtjof Nansen and later for the League of Nations. In the absence of diplomatic relations between Britain and Soviet Russia, he represented British interests at the Norwegian legation in Moscow (1927–29). As minister of defense in an agrarian government (1931–33), he gained notoriety for repressing a strike by hydroelectrical workers. He resigned from the government in 1933 to form the fascist Nasjonal Samling (National Union) Party, which stood for suppression of Communism and unionism, but he never gained a seat in the Storting (parliament).

At a meeting with Adolf Hitler in December 1939, Quisling urged a German occupation of Norway; after the German invasion of April 1940, he proclaimed himself head of the government. Although his regime came under widespread bitter attack and collapsed within a week, he continued to serve in the occupation government and was named “minister president” in February 1942 under Reich commissioner Josef Terboven.

Quisling's attempts to convert the church, schools, and youth to National Socialism aroused fervent Norwegian opposition. He was held responsible for sending nearly 1,000 Jews to die in concentration camps. After the liberation of Norway in May 1945, he was arrested, found guilty of treason and other crimes, and executed.