Victor Adler (1852-1918), also spelled Viktor, was an Austrian physician and politician. Early in his political career, he was most strongly associated with Pan-German nationalism and was a coauthor of the Linz Program (1882). He founded the Social Democratic Party of Austria and was involved with concerns of the working class.
A Jew, he cooperated with Georg, Ritter von Schönerer, although the latter became an anti-Semite and issued an 1885 version of the Linz Program with antisemitic features. Adler advocated the Anschluss (unification) of Austria with Germany. He moved through the provincial legislatures and, in 1918, was Secretary of State for Foreign Affairs, dying on the day World War I ended, the day before the abortive 1918 Anschluss was announced.