Albert VI (born December 12, 1418 in Vienna, died December 2, 1463 in Vienna) was a Habsburg Archduke and son of Ernest the Iron. From 1446, he was the Regent of Further Austria and quarreled with his brother Emperor Frederick III (Frederick V as Duke). From 1458 to 1463 he ruled Austria above the Enns (later known as Upper Austria). After laying siege to Frederick in the fortification of Vienna, he also took over the reign of Austria below the Enns (now Lower Austria) in 1462.