Panaetius (c. 185 - c. 110/09 BCE) of Rhodes is a Stoic philosopher.
He is a pupil of Diogenes of Babylon and Antipater of Tarsus in Athens, before moving to Rome where he does much to introduce Stoic doctrines to the city.
After the death of Scipio in 129, he returns to the Stoic school in Athens, and is its last undisputed scholarch.
With Panaetius, Stoicism becomes much more eclectic.
His most famous work is his On Duties, the principal source used by Cicero in his own work of the same name.