Louis I

Louis I may refer to:

• Louis the Pious, Louis I of France, "the Pious" (778–840), king of France and Holy Roman Emperor
• Ludwig I of Thuringia (ruled 1123–1140)
• Louis I of Blois (1172–1205)
• Louis VIII of France who claimed the throne of England as Louis I of England, (1216-1217)
• Louis I Wittelsbach, Duke of Bavaria (1173–1231)
• Louis I, Duke of Bourbon (1279–1342)
• Louis I of Flanders (1304–1346)
• Louis I of Châtillon (died 1346)
• Louis I of Hungary, Louis I of Poland and Hungary, (1326–1382)
• Louis I of Naples (1339–1384)
• Louis of Valois, Duke of Orléans (1372–1407)
• Louis I, Duke of Bar (died in 1430)
• Louis I, Count of Montpensier (1405–1486)
• Louis I de Bourbon, Prince de Condé (1530–1569)
• Louis I, Cardinal of Guise (1527–1578)
• Louis I of Spain (1707–1724)
• Louis I, Grand Duke of Hesse (1753-1830), previously Louis X, Landgrave of Hesse-Darmstadt
• Ludwig I of Bavaria (1786–1868)
• Luís I of Portugal (1838–1889)