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'''Louis IV''' or '''Ludwig IV''' may refer to:

* [[Louis the Child]], also known as Louis IV (893–911)
* [[Louis IV of France]] (920–954)
* [[Louis IV, Count of Chiny]] (c. 1173 to 1177–1226)
* [[Louis IV, Landgrave of Thuringia]] (1200–1227)
* [[Louis IV, Count of Looz]] (died 1336)
* [[Louis IV, Holy Roman Emperor]] (1282–1347)
* [[Louis IV, Elector Palatine]] (1424–1449)
* [[Louis IV de Bueil, Comte de Sancerre]] (died c. 1565)
* [[Louis IV, Landgrave of Hesse-Marburg]] (1537–1604)
* [[Louis IV, Prince of Condé]] or Louis Henri, Duke of Bourbon (1692–1740)
* [[Louis IV, Grand Duke of Hesse]] (1837–1892)

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