| Mazyar | |
|---|---|
| Ispahbadh Padishkhwargarshah | |
 Bust of Mazyar in Sari, Iran | |
| Ispahbadh of the Qarinvand dynasty | |
| Reign | 817–839 |
| Predecessor | Qarin ibn Vindadhhurmuzd |
| Successor | Quhyar |
| Ispahbadh of Tabaristan | |
| Reign | 825/6-839 |
| Predecessor | Shapur (Bavandids) Vinda-Umid (Paduspanids) |
| Successor | Qarin I |
| Born | ca. 800 Lafur, Tabaristan |
| Died | September 839 Samarra |
| Dynasty | Qarinvand dynasty |
| Father | Qarin ibn Vindadhhurmuzd |
| Religion | Zoroastrianism |
Mazyar (Middle Persian: Māh-Izād; Mazandarani/Persian: مازیار, romanized: Māzyār) was an Iranian prince from the Qarinvand dynasty, who was the ruler (ispahbadh) of the mountainous region of Tabaristan from 825/6 to 839. For his resistance to the Abbasid Caliphate, Mazyar is considered one of the national heroes of Iran by twentieth-century Iranian nationalist historiography. His name means "protected by the yazata of the moon".