Pherecydes of Leros (Ancient Greek: Φερεκύδης) was, according to the Suda, an ancient Greek historian from the island of Leros. He is said to have lived "before the seventy-fifth Olympiad" (480–477 BC) and authored three works: On Leros (Περὶ Λέρου), On Iphigenia (Περὶ Ἰφιγενείας), and On the Festivals of Dionysus (Περὶ τῶν Διονύσου ἑορτῶν).
Although the Suda treats him as a distinct individual, some scholars believe he may be the same person as Pherecydes of Athens.
Pherecydes of Athens (Ancient Greek: Φερεκύδης) (fl. c. 465 BC) was a Greek mythographer who wrote an ancient work in ten books, now lost, variously titled "Historiai" (Ἱστορίαι) or "Genealogiai" (Γενελογίαι). He is one of the authors (= FGrHist 3) whose fragments were collected in Felix Jacoby's Die Fragmente der griechischen Historiker.
He is generally thought to be different from the sixth-century Pre-Socratic philosopher Pherecydes of Syros, who was sometimes mentioned as one of the Seven Sages of Greece and was reputed to have been the teacher of Pythagoras. Although the Suda considers them separately, he is possibly the same person as Pherecydes of Leros.