Leopold III of Austria may refer to:
Leopold III, Margrave of Austria, the Saint (1050–1136), Margrave of Austria from the house of Babenberg Leopold III, Duke of Austria, (1351–1386), Duke of Styria, Carinthia, Tyrol, and Vorderösterreich of House of Habsburg, died in Battle of Sempach
See also Leopold III (disambiguation) List of rulers of Austria Habsburg