The gens Passiena, occasionally written Passienia, Passenia, Passennia, or Passenna, was a plebeian family at ancient Rome, originally of equestrian rank, but at least one member was later admitted to the patriciate. Members of this gens appear in history from the early years of the Empire down to the third century, and several obtained the consulship, beginning with Lucius Passienus Rufus in 4 BC.