Lajtabánság or "Banate of Leitha" (; ) was a short-lived western Hungarian state in the region where the Austrian federal state of Burgenland now exists. It existed between October 4 and November 10, 1921, following the Treaty of Trianon and the departure of the rump Kingdom of Hungary's army and after the Sopron plebiscite was held in the area according to the Venice protocol.