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)
Famous quotes containing the word louis:
“The frost was on the village roofs as white as ocean foam;
The good red fires were burning bright in every ‘longshore home;
The windows sparkled clear, and the chimneys volleyed out;
And I vow we sniffed the victuals as the vessel went about.”
—Robert Louis Stevenson (1850–1894)