Karl-Konstantin von Habsburg (Given names: Karl-Konstantin Michael Stephan Maria; born on 20 July 2004 in Budapest) referred to in Austria as Karl-Konstantin Habsburg-Lothringen, in Hungary as Habsburg Károly Konstantin, and also as Archduke Karl-Konstantin of Austria, is the only son of Georg von Habsburg and Duchess Eilika of Oldenburg.
As of 2016, he is considered third in line of succession to the former Austro-Hungarian throne.
He is the great-grandson of Emperor Charles I of Austria through his grandfather Otto von Habsburg.
Through his maternal grandfather, he is a descendant of George II of Great Britain, and would therefore be in line for the British throne were he not a Catholic and barred by the Act of Settlement.