| Ariobarzanes I | |
|---|---|
 Coin of Ariobarzanes, minted at Mazaca in 83/82 BC | |
| King of Cappadocia | |
| Reign | 95–63/62 BC |
| Predecessor | Ariarathes VIII (Ariarathid dynasty) |
| Successor | Ariobarzanes II |
| Spouse | Athenais Philostorgos I |
| Issue | Ariobarzanes II |
Ariobarzanes I (Ancient Greek: Ἀριοβαρζάνης), surnamed Philoromaios (Ancient Greek: Φιλορωμαίος, romanized: Philorōmaíos, "Friend to the Romans"), was the first Ariobarzanid king of Cappadocia from 95 BC to 63/62 BC. Ariobarzanes I was a Cappadocian nobleman of obscure origins who was of Persian descent.