Parthenius of Nicaea or Myrlea in Bithynia  was a Greek grammarian and poet. According to the Suda, he was the son of Heraclides and Eudora, or according to Hermippus of Berytus, his mother's name was Tetha. He was taken prisoner by Helvius Cinna in the Mithridatic Wars and carried to Rome in 72 BC. He subsequently visited Neapolis, where he taught Greek to Virgil, according to Macrobius. Parthenius is said to have lived until the accession of Tiberius in 14 AD.