Hans-Adam II is the Prince of Liechtenstein. He is the son of Prince Franz Joseph II and his wife, Countess Georgina von Wilczek. He also bears the titles Duke of Troppau and Jägerndorf, and Count of Rietberg. Under his reign, a 2003 constitutional referendum expanded the powers of the Prince of Liechtenstein. In 2004, Hans-Adam transferred day-to-day governmental duties to his eldest son Hereditary Prince Alois as regent, like his father had granted him in 1984 to prepare him for the role.

The monarchy of Liechtenstein is the constitutional form of government by which a hereditary sovereign reigns as the head of state of Liechtenstein. The current monarch is Prince Hans-Adam II. The House of Liechtenstein, after which the sovereign principality was named in 1719, hails from Liechtenstein Castle in Lower Austria, which the family possessed from the middle of the twelfth century to the thirteenth century, and from 1807 onward. It is the only remaining European monarchy that practises strict agnatic primogeniture.