Philostephanus of Cyrene (Philostephanus Cyrenaeus) was a Hellenistic writer from North Africa, who was a pupil of the poet Callimachus in Alexandria and doubtless worked there during the 3rd century BC.
His history of Cyprus, De Cypro, written during the reign of Ptolemy Philopator (222–206 BC), has been lost, but it was known to at least two Christian writers, Clement of Alexandria and Arnobius. It contained a narration of the story of the mythical king Pygmalion, of Cyprus, who fashioned a cult image of the Greek goddess Aphrodite that came to life. Ovid depended on the account by Philostraphanus for his dramatised and expanded version in Metamorphoses, through which the Pygmalion myth was transmitted to the medieval and modern world..
The remarks on Cyprus seem to have come from a larger work, On Islands. Scattered brief quotes of Philostephanus on islands refer also to Sicily, Calauria off the coast of Troezen and Stryme, off the Thracian coast. Pliny's Natural History adduces Philostephanus as a source for the assertion Jason was the first that went out to sea in a long vessel.
The fragments of Philostephanus, surviving in quotes from other authors, were published in Fragmenta historicorum graecorum
Another Philostephanus was a comic poet, of whom little is known.