crown prince
heir to the throne
Prince of Asturias
heir to the Castilian and then Spanish throne
Crown Prince of Saudi Arabia
second most important position in Saudi Arabia, second to the King
Crown Prince of Tonga
heir to the Tongan throne
Crown Prince of Oman
Successor to the sultan of Oman
Crown Prince of Greece
heir to the defunct throne of Greece
Crown Prince of Romania
Title held by the male heir apparent of Romania
Dauphin of France
title given to the heir apparent to the throne of France
Duke of Braganza
Portuguese title that has been used for example by several heirs-apparent to the Portuguese throne
Crown Prince of Japan
heir apparent of Emperor of Japan
Prince of Portugal
title of the heir of the Kingdom of Portugal
Crown Prince of Thailand
Heir apparent to the Thai throne
crown prince
heir presumptive of Japan
Crown Prince of Jordan
heir-Apparent to the Jordanian Throne