Prince Karl
- Archduke Karl Pius of Austria, Prince of Tuscany
- Archduke Karl Salvator of Austria
- Archduke Karl of Austria
- Carl Friedrich Wilhelm, 1st Prince of Leiningen
- Carl Ludwig II, Prince of Hohenlohe-Langenburg
- Carl XVI Gustaf of Sweden
- Carl of Sweden (disambiguation)
- Carl, 3rd Prince of Leiningen
- Carl, Prince of Wied
- Carol I of Romania
- Carol Victor, Hereditary Prince of Albania
- Charles Anthony, Prince of Hohenzollern
- Charles Christian, Prince of Nassau-Weilburg
- Charles Edward, Duke of Saxe-Coburg and Gotha
- Charles Eugene, Prince of Lambesc
- Charles Gonthier, Prince of Schwarzburg-Sondershausen
- Charles I Louis, Elector Palatine
- Charles I of Austria
- Charles IX of Sweden
- Charles Louis, Hereditary Prince of Baden
- Charles Louis, Prince of Anhalt-Bernburg-Schaumburg-Hoym
- Charles XIII of Sweden
- Charles XIV John of Sweden
- Charles XV of Sweden
- Charles of Saxony, Duke of Courland
- Charles, Grand Duke of Baden
- Charles, Prince of Hohenzollern-Sigmaringen
- Charles-Joseph, 7th Prince of Ligne
- Count Carl Johan Bernadotte of Wisborg
- Haakon VII of Norway
- Karel Schwarzenberg
- Karl Alexander, 5th Prince of Thurn and Taxis
- Karl Alois, Prince Lichnowsky
- Karl Anselm, 4th Prince of Thurn and Taxis
- Karl Anselm, Duke of Urach
- Karl Anton August, Prince of Schleswig-Holstein-Sonderburg-Beck
- Karl August von Hardenberg
- Karl August, 10th Prince of Thurn and Taxis
- Karl August, Prince of Waldeck and Pyrmont
- Karl Eusebius, Prince of Liechtenstein
- Karl Frederick, Prince of Anhalt-Bernburg
- Karl Friedrich, Prince of Hohenzollern
- Karl George Lebrecht, Prince of Anhalt-Köthen
- Karl Gero, Duke of Urach
- Karl I, Prince of Anhalt-Zerbst
- Karl I, Prince of Liechtenstein
- Karl Max, Prince Lichnowsky
- Karl Philipp von Wrede
- Karl Philipp, Prince of Schwarzenberg
- Karl, 12th Prince Kinsky of Wchinitz and Tettau
- Karl, 6th Prince of Leiningen
- Karl, 8th Prince Kinsky of Wchinitz and Tettau
- Karl, Prince of Anhalt-Zerbst
- Prince Carl Bernadotte
- Prince Carl Christian of Hohenzollern
- Prince Carl Oscar, Duke of Södermanland
- Prince Carl Philip, Duke of Värmland
- Prince Carl of Solms-Braunfels
- Prince Carl, Duke of Västergötland
- Prince Carlos (disambiguation)
- Prince Charles (disambiguation)
- Prince Charles of Hesse and by Rhine
- Prince Charles of Prussia
- Prince Charles, Count of Flanders
- Prince Karl (play)
- Prince Karl Anton of Hohenzollern
- Prince Karl Borromäus of Liechtenstein
- Prince Karl Emich of Leiningen
- Prince Karl Franz of Prussia
- Prince Karl Johann of Liechtenstein
- Prince Karl Theodor of Bavaria
- Prince Karl of Auersperg
- Prince Karl of Bavaria (1874–1927)
- Prince Karl of Leiningen