Karl Ludwig

Karl or Carl Ludwig may refer to:


 * Charles I Louis, Elector Palatine (1617–1680)
 * Karl Ludwig, Prince of Hohenlohe-Langenburg (1762–1825)
 * Archduke Karl Ludwig of Austria (1833–1896)
 * Carl Ludwig (1816–1895), German physician and physiologist
 * Carl Ludwig (Medal of Honor) (1841–1913), Union Army soldier and Medal of Honor recipient
 * Karl Ludwig (footballer) (1886–1948), German footballer
 * Archduke Carl Ludwig of Austria (1918–2007)
 * Karl Ludwig (sledge hockey) (born 1988), Canadian ice sledge hockey player