Ariamnes I (Ancient Greek: Ἀριάμνης Ariámnēs; fl. 4th century BC; ruled 362–350 BC) was satrap of Cappadocia under Persian suzerainty. Son of Datames and father of Ariarathes I and his brother Orophernes (Holophernes), Diodorus states that Ariamnes governed fifty years although it is unclear how this could be correct given the dates that his father Datames (ruled 385-362 BC) and his son Ariarathes I (ruled 350-331 BC) were satraps of Cappadocia.
- Diodorus Siculus, Bibliotheca, xxxi. 3
- Hazel, John; Who's Who in the Greek World, "Ariamnes I" (1999)
- Smith, William (editor); Dictionary of Greek and Roman Biography and Mythology, "Ariamnes I", Boston (1867)
- This article incorporates text from a publication now in the public domain: Smith, William, ed. (1870). "Ariamnes". Dictionary of Greek and Roman Biography and Mythology. p. 283.