Prince Joachim of Belgium, Archduke of Austria-Este (Joachim Karl-Maria Nikolaus Isabelle Marcus d’Aviano, born 9 December 1991), Prince Royal of Hungary and Bohemia, is the younger son and third child of Lorenz, Archduke of Austria-Este and Princess Astrid of Belgium.

Prince Joachim was born at the University Clinic St. Luc, Woluwe-St-Lambert, Belgium and is currently ninth in line to the Belgian throne. He is the first female-line member of the Belgian Royal Family to be born a Prince of Belgium, with succession rights to the throne: his older brother and sister were created Prince and Princess of Belgium in December 1991, several years after their birth.

All of his grandparents and great-grandparents are royal or noble; he descends from the Austrian, Belgian, Italian, French, Swedish, Danish, British, Portuguese, Spanish and German royal and imperial families.

He attended Malvern College in Worcestershire, England in 2010.

He enlisted in a voluntary army training course at the Centre for Basic Training in Arlon, Belgium on 16 November 2010. On 29 July 2011, he also finished his education at the Nautical School in Brugge to become an officer in the Belgian Navy.

He studied for a “Bachelor of International Economics, Management and Finance” from September 2011 at Bocconi University in Milan