Mu'ayyad al-Daula (died 983) was the Buyid amir of Hamadan (976–983), Jibal (977–983), Tabaristan (980–983), and Gorgan (981–983). He was the third son of Rukn al-Daula.
As part of the settlement between Rukn al-Daula and his eldest son 'Adud al-Daula in early 976, Mu'ayyad al-Daula was to receive Hamadan upon his father's death, in exchange for recognizing 'Adud al-Daula as senior amir. Only a year later, Rukn al-Daula's second son Fakhr al-Daula, who ruled in Ray, rebelled against 'Adud al-Daula's authority. Mu'ayyad al-Daula mobilized in support of 'Adud al-Daula, forcing Fakhr al-Daula to flee to the Ziyarids of Gorgan and Tabaristan. This did not stop the two Buyids; 'Adud al-Daula took Gorgan in 980, while Mu'ayyad al-Daula gained control of Tabaristan in 981. Mu'ayyad al-Daula was entrusted with the newly-captured provinces as 'Adud al-Daula's subordinate.
'Adud al-Daula died in March 983, and Mu'ayyad al-Daula followed him shortly afterwards. His vizier, Sahib ibn 'Abbad, summoned a gathering of the army and convinced its leaders to proclaim Fakhr al-Daula as his successor.
| Preceded by Rukn al-Daula |
Buyid Amir (in Hamadan) 976–983 |
Succeeded by Fakhr al-Daula |
| Preceded by Fakhr al-Daula |
Buyid Amir (in Ray) 977–983 |
Succeeded by Fakhr al-Daula |
| Preceded by None |
Buyid Amir (in Gorgan) 980–983 |
Succeeded by Fakhr al-Daula |
| Preceded by None |
Buyid Amir (in Tabaristan) 981–983 |
Succeeded by Fakhr al-Daula |