Roman poet who wrote the mythological epic poem Zmyrna, about the incestuous love of Zmyrna for her father. He was a friend of the poet Catullus. The early Christian-era historians Suetonius, Valerius Maximus, Appian, and Dio Cassius all state that at Caesar's funeral (44 BC) a certain Helvius Cinna was killed by mistake in place of Lucius Cornelius Cinna (Cinna, Lucius Cornelius), the conspirator. The last three writers identify him as a tribune of the people, while Plutarch states that he was a poet. On the other hand, two lines in the 9th eclogue of Virgil, supposed to have been written in 41 or 40 BC, seem to imply that Helvius Cinna was then alive.

Apart from his epic Zmyrna, Cinna is credited with having written Propemptikon Pollionis, a poem in the form of a send-off to his friend Asinius Pollio. In both these poems, his model appears to have been Parthenius of Nicaea, the Greek poet and teacher of Virgil; Cinna apparently met Parthenius while serving in Bithynia in 66 BC and then brought him to Rome. Cinna's language and his literary and mythological allusions were so obscure that both poems required learned commentaries within a generation, in the age of Augustus; Lucius Crassicius composed a commentary on Zmyrna, and Julius Hyginus annotated Propemptikon Pollionis.