'''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)
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