Antonius (fem. Antonia) was the nomen of the gens Antonia, one of the most important plebeian (meaning not patrician) families of ancient Rome. The family claimed descendancy from Anton, a son of the Greek god Hercules. Women of the family carried the name Antonia, according to the Roman naming convention. The Antonii produced several important Roman generals and politicians, listed below.
Emperors Gordian I, Gordian II and Gordian III were also members of the Antonius gens, although not directly related to the Republic protagonists cited above.