Archduke Ferdinand Karl Joseph of Austria-Este (April 25, 1781 – November 5, 1850) was the third son of Archduke Ferdinand of Austria-Este and of his wife Princess Maria Beatrice Ricciarda d'Este, last member and heiress of the House of Este. For much of the Napoleonic Wars he was in command of the Austrian army. In 1815 in the war of the Seventh Coalition against France, Ferdinand commanded two divisions of the Austrian Reserve. The following year he was appointed military commander in Hungary. Ferdinand never married. In 1850 he died at Schloss Ebenzweier in Altmünster near Gmunden, Austria.