Fronius is a German surname of Siebenbürger Sachse origin. The Fronius family maintained an aristocratic status within the autonomous region of Siebenbürgen.
People with the surname include:
Andreas Fronius (c. 1500-?), city magistrate of Kronstadt, Siebenbürgen, and father of Matthias Fronius
Franz Friedrich Fronius (1829–1886), Transylvanian-Saxon botanist, ethnologist and Lutheran cleric
Günter Fronius (born 1907), entrepreneur, founder of Fronius International GmbH
Hans Fronius (1903-1988), Austrian painter and illustrator
Marcus Fronius (1659-1713), Lutheran theologian, pedagogue and author
Matthias Fronius (1522-1588), Lutheran cleric and city magistrate of Kronstadt
