Fronius

Fronius is a German surname of Transylvanian Saxon 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 1907-2015), Austrian entrepreneur
 * Fronius International, an Austrian company founded by Günter Fronius
 * 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
 * Sigrid Fronius (born 1942), German author and journalist