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 (Medal of Honor), Union Army soldier and Medal of Honor recipient
- Karl Ludwig (footballer), German footballer
- Archduke Carl Ludwig of Austria (1918–2007)
- Karl Ludwig (sledge hockey), Canadian ice sledge hockey player