Prince Aribert Joseph Alexander of Anhalt was regent of Anhalt from September to November 1918 on behalf of his underage nephew Joachim Ernst, Duke of Anhalt. As regent, following the German revolution, he abdicated in the name of his nephew on 12 November 1918, thus ending the rule of the House of Ascania in Anhalt.

Joachim Ernst, Duke of Anhalt was the last ruler of the Duchy of Anhalt.