Louis III
Louis III may refer to:
- Louis the Younger, sometimes III of Germany
- Louis III of France
- Louis the Blind, Louis III, Holy Roman Emperor,
- Louis the Child, sometimes III of Germany
- Louis III, Count of Chiny
- Ludwig III of Thuringia, see Hermann I, Landgrave of Thuringia
- Louis III of Châtillon
- Louis III of Naples
- Louis III, Elector Palatine
- Louis III, Landgrave of Hesse, nicknamed "the Frank"
- Louis III, Count of Löwenstein
- Louis III, Duke of Württemberg
- Louis III, Cardinal of Guise
- Louis III, Prince of Condé
- Ludwig III, Grand Duke of Hesse and by Rhine
- Ludwig III of Bavaria