The House of Schwarzenberg is a German (Franconian) and Czech (Bohemian) aristocratic family, formerly one of the most prominent European noble houses. The Schwarzenbergs are members of the German and Czech nobility, and they once held the rank of Princes of the Holy Roman Empire. The family belongs to the high nobility and traces its roots to the Lords of Seinsheim during the Middle Ages.

The House of Eggenberg was the name of an influential Austrian noble family from Styria, who achieved princely rank in the 17th century. The family's last male heir died in 1717, bringing an end to the House of Eggenberg.