Ariarathes IV of Cappadocia

For other people named Ariarathes, see Ariarathes (disambiguation).
Coin of Ariarathes IV. Obv: head of Ariarathes diademed. Rev: Athens standing holding Nike, legend BΑΣΙΛΕΩΣ ΑΡΙΑΡΑΘΟΥ EYΣΕΒΟΥΣ.

Ariarathes IV, surnamed Eusebes, "the Pious", (Ancient Greek: Ἀριαράθης Εὐσεβής, Ariaráthēs Eusebḗs), was the king of Cappadocia in 220–163 BC.