The Austrian Civil War of 12–15 February 1934, also known as the February Uprising or the February Fights, was a series of clashes in the First Austrian Republic between the forces of the authoritarian right-wing government of Engelbert Dollfuss and the Republican Protection League, the banned paramilitary arm of the Social Democratic Workers' Party of Austria. The fighting started when League members fired on the Austrian police who were attempting to enter the Social Democrats' party headquarters in Linz to search for weapons. It spread from there to Vienna and other industrial centres in eastern and central Austria. The superior numbers and firepower of the Austrian police and Federal Army quickly put an end to the uprising. The overall death toll is estimated at about 350.

The First Austrian Republic, officially the Republic of Austria, was created after the signing of the Treaty of Saint-Germain-en-Laye on 10 September 1919—the settlement after the end of World War I which ended the Habsburg rump state of Republic of German-Austria—and ended with the establishment of the Austrofascist Federal State of Austria based upon a dictatorship of Engelbert Dollfuss and the Fatherland's Front in 1934. The Republic's constitution was enacted on 1 October 1920 and amended on 7 December 1929. The republican period was increasingly marked by violent strife between those with left-wing and right-wing views, leading to the July Revolt of 1927 and the Austrian Civil War of 1934.