The Czechoslovak Social Democratic Workers Party in the Republic of Austria (Czech: Československá sociálně demokratická strana dělnická v republice Rakoúské) was a political party in Austria, working amongst the Czech minority. The party was founded on December 7, 1919, as the Vienna branch of the Czechoslovak Social Democratic Workers Party separated itself from the party centre in Prague (with the break-up of the Austro-Hungarian empire the party branches in Vienna and Prague were now parts of two different states). The party worked closely together with the Social Democratic Workers Party of Austria (SDAPÖ), and cooperated with the Austrian Social Democrats on all political issues. The party contested parliamentary elections on joint lists together with SDAPÖ.