The name Herennius may refer to:
Herennius Pontius (fl. c. 340 BC), Samnite statesman, father of Gaius Pontius Marcus Herennius (consul 93 BC) Gaius Herennius (otherwise unknown), addressee of the book Rhetorica ad Herennium Marcus Herennius Picens (consul 34 BC) Herennius Senecio (died c. 90), Roman writer, biographer of Helvidius Priscus Herennius Philo, also known as Philo of Byblos (c. 64–141), scholar Lucius Herennius Saturninus, suffect consul in AD 100 Publius Herennius Dexippus (c. 210–273), the Greek historian most often known as Dexippus Herennius (fl. c. 240), a Neoplatonic philosopher; see Ammonius Saccas Herennius Modestinus (fl. c. 250), Roman jurist Herennius Etruscus (c. 227–251), Roman emperor
See also Herennia Etruscilla, the mother of Herennius Etruscus Herennia gens, all people who had the gentilicium Herennius in their name.