Prince of Orange is a title of nobility.
The title is used by members of the House of Orange-Nassau, as heirs to the crown of the Netherlands. It also used by members of the House of Hohenzollern. At the moment, the title is used by Prince Willem-Alexander of the Netherlands (Orange-Nassau), Georg Friedrich, Prince of Prussia (Hohenzollern) and Guy, Marquis de Mailly-Neslé, Prince d'Orange.