Heracleides (or Heraclides) of Cyme (Greek: Ἡρακλείδης; fl. 350 B.C.) is a little-attested Greek historian who wrote a multivolume Persica, or history of Persia, not extant. Fragments from the Persica are preserved primarily by Athenaeus and it describe the customs of the Persian court. Heracleides was himself a subject of Persia under the Achaemenid Empire.
For discussion of passages from the Persica, see Pierre Bryant, From Cyrus to Alexander: A History of the Persian Empire, translated by Peter Daniels (EIsenbrauns, 2002), limited preview online; search "Heraclides of Cyme"