Prince of Orange is a title of nobility, originally associated with the Principality of Orange, in what is now southern France. In French it is la Principauté d'Orange.
The title is carried by members of the House of Orange-Nassau, as heirs to the crown of the Netherlands which, since 1983, descends via absolute primogeniture - meaning that the Orange-Nassau holder can be either Prince or Princess of Orange.
Rival claims to the title are made by members of the House of Hohenzollern and the family of Mailly.
The current users of the title are Catharina-Amalia, Princess of Orange suo jure (Orange-Nassau), Georg Friedrich, Prince of Prussia (Hohenzollern), and Guy, Marquis de Mailly-Nesle (Mailly).