A Louis is a type of gold coin issued in France and named after the French king. See Louis (coin) for more detail.
A number of famous people in history were named Louis:
- Duke Louis VI the Roman of Bavaria
- King Louis I of Bavaria
- King Louis II of Bavaria
- Prince Louis-Victor de Broglie
- Prince Louis II de Condé
- King Louis the Pious of France
- King Louis the Stammerer of France
- King Louis III of France
- King Louis IV of France
- King Louis V of France
- King Louis VI of France
- King Louis VII of France
- King Louis VIII of France
- King Louis IX of France
- King Louis X of France
- King Louis XI of France
- King Louis XII of France
- King Louis XIII of France
- King Louis XIV of France
- King Louis XV of France
- King Louis XVI of France
- King Louis XVIII of France
- King Louis the German of Germany
- King Louis the Child of Germany
- King Louis I of Hungary
- King Louis II of Hungary
- Prince Louis II of Monaco
- King Louis of Portugal
- Prince Louis de Rohan
- Emperor Louis II of the Romans
- Emperor Louis IV of the Romans
- Duke Louis of Savoy
- King Louis of Spain
- Louis Armstrong
