Louis I

Louis I may refer to:

Cardinals

Ludwig I, Count of Württemberg (c. 1098–1158)
Louis I of Blois (1172–1205)
Louis I of Flanders (1304–1346)
Louis I of Châtillon (died 1346)
Louis I, Count of Montpensier (1405–1486)
Louis Günther I, Count of Schwarzburg-Rudolstadt (1581–1646)

Louis I Wittelsbach, Duke of Bavaria (1173–1231)
Louis I, Duke of Bourbon (1279–1342)
Louis of Valois, Duke of Orléans (1372–1407)
Louis I, Duke of Bar (died in 1430)
Louis I, Grand Duke of Hesse (1753–1830), previously Louis X, Landgrave of Hesse-Darmstadt

Louis the Pious, Louis I of France, "the Pious" (778–840), king of France and Holy Roman Emperor
Louis I of Hungary, Louis I of Poland and Hungary, (1326–1382)
Louis I of Naples (1339–1384)
Louis I of Spain (1707–1724)
Louis I of Etruria (1773–1803)
Louis Bonaparte (1778–1846), King of Holland 1806–1810 as Louis I
Ludwig I of Bavaria (1786–1868)
Luís I of Portugal (1838–1889)
Louis VIII of France who claimed the throne of England as Louis I of England, (1216–1217)
Louis X of France, also known as Louis I of Navarre (1289–1316)