Karl Ludwig
Karl or Carl Ludwig may refer to:
- Charles I Louis, Elector Palatine
- Karl Ludwig, Prince of Hohenlohe-Langenburg
- Archduke Karl Ludwig of Austria
- Carl Ludwig, German physician and physiologist
- Carl Ludwig , Union Army soldier and Medal of Honor recipient
- Karl Ludwig , German footballer
- Archduke Carl Ludwig of Austria
- Karl Ludwig , Canadian ice sledge hockey player