Louis IV
Louis IV or Ludwig IV may refer to:
- Louis the Child, also known as Louis IV
- Louis IV of France
- Louis IV, Count of Chiny
- Louis IV, Landgrave of Thuringia
- Louis IV, Count of Looz
- Louis IV, Holy Roman Emperor
- Louis IV, Elector Palatine
- Louis IV de Bueil, Comte de Sancerre
- Louis IV, Landgrave of Hesse-Marburg
- Louis IV, Prince of Condé or Louis Henri, Duke of Bourbon
- Louis IV, Grand Duke of Hesse