Louis IV or Ludwig IV may refer to:
- Louis the Child, also known as Louis IV (893âÂÂ911)
- Louis IV of France (920âÂÂ954)
- Louis IV, Count of Chiny (c. 1173 to 1177âÂÂ1226)
- Louis IV, Landgrave of Thuringia (1200âÂÂ1227)
- Louis IV, Count of Looz (died 1336)
- Louis IV, Holy Roman Emperor (1282âÂÂ1347)
- Louis IV, Elector Palatine (1424âÂÂ1449)
- Louis IV de Bueil, Comte de Sancerre (died c. 1565)
- Louis IV, Landgrave of Hesse-Marburg (1537âÂÂ1604)
- Louis IV, Prince of Condé or Louis Henri, Duke of Bourbon (1692âÂÂ1740)
- Louis IV, Grand Duke of Hesse (1837âÂÂ1892)