Louis III

Louis III may refer to:


 * Louis the Younger, sometimes III of Germany (835–882)
 * Louis III of France (865–882)
 * Louis the Blind, Louis III, Holy Roman Emperor, (c. 880–928)
 * Louis the Child, sometimes III of Germany (893–911)
 * Louis III, Count of Chiny (died 1189)
 * Ludwig III of Thuringia (ruled 1172–1190), see Hermann I, Landgrave of Thuringia
 * Louis III of Châtillon (died 1391)
 * Louis III of Naples (1403–1434)
 * Louis III, Elector Palatine (ruled 1410–1436)
 * Louis III, Landgrave of Hesse, nicknamed "the Frank" (1438–1471)
 * Louis III, Count of Löwenstein (1530–1611)
 * Louis III, Duke of Württemberg (1554–1593)
 * Louis III, Cardinal of Guise (1575–1621)
 * Louis III, Prince of Condé (1668–1710)
 * Ludwig III, Grand Duke of Hesse and by Rhine (1806–1877)
 * Ludwig III of Bavaria (1845–1921)