| Arshak III | |
|---|---|
| King of Armenia | |
| Reign | 378–387 |
| Predecessor | Pap of Armenia |
| Successor | Khosrov IV of Armenia |
| Co-ruler | Vologases of Armenia |
| Born | 371 |
| Died | 390 (aged 18–19) |
| House | Arsacid |
| Father | Papas (Pap) |
| Mother | Zarmandukht |
Arshak III,[1] also known as Arsaces III or Arsak III[2] (flourished 4th century) was an Arsacid prince who served as a Roman client king of Armenia from 378 until 387. Arshak III is often known as the last serving Roman client king of Armenia. During his reign, the part of Armenia that Arshak III governed was under Roman rule from the Peace of Acilisene.