Hans-Adam II (Johannes Adam Ferdinand Alois Josef Maria Marco d'Aviano Pius; born 14 February 1945) is the reigning Prince of Liechtenstein. He is the son of Franz Joseph II, Prince of Liechtenstein (1906–1989) and his wife Countess Georgina von Wilczek (1921–1989). He also bears the titles Duke of Troppau and Jägerndorf, and Count Rietberg.

Prince Hans-Adam was born on 14 February 1945 in Zürich, Switzerland as the eldest son of Prince Franz Joseph II and Princess Gina of Liechtenstein. His father had succeeded as Prince of Liechtenstein upon the death of his childless grand-uncle, Prince Franz I, in 1938, and Hans-Adam was thus hereditary prince from birth.

In 1969, Hans-Adam graduated from the University of St. Gallen with a Licentiate (equivalent to an undergraduate degree) in Business and Economic Studies.

In 1984, Prince Franz Joseph II, while legally remaining head of state and retaining the title of sovereign prince, formally turned the power of making day-to-day governmental decisions over to his eldest son as a way of beginning a dynastic transition to a new generation. Hans-Adam formally succeeded as Prince of Liechtenstein upon the death of his father on 13 November 1989.

A referendum to adopt Hans-Adam's revision of the constitution to expand his powers passed in 2003. The prince had threatened to leave the country if the referendum did not result in his favor.

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