| Background: | Kurdish |
| Sadr Al-Din Musa | |
| Murshid | |
| Predecessor: | Safi-ad-din Ardabili |
| Successor: | Khvajeh Ali Safavi |
| Birth Date: | 1305 |
| Birth Place: | Ardabil, modern day Iran |
| Death Date: | 1391 |
| Religion: | Islam, Sunni (Shafi'i) |
Sadr al-Din Musa (1305-1391) (صدرالدین موسی) was the son and successor of Safi-ad-din Ardabili. His mother was Bibi Fatima, daughter of Zahed Gilani. Sadr al-Din directed the Safaviyya for 59 years. During this time, the activities of the Safaviyya were viewed with favour by Timur, who provided an endowment for the shrine of Safi-ad-din Ardabili in Ardabil, and allowed Sadr al-Din to collect taxes. Timur also offered Sadr al-Din to request any favour from himself, and Sheikh Sadr al-Din asked for the release of Turkish prisoners captured by Timur from Diyarbakır. Timur accepted this request, and the freed prisoners became Sadr al-Din's loyal disciples. The descendants of these freed prisoners, emigrating by the thousands into Gilan Province, would later aid his family to found a dynasty.[1] [2]
He was buried at Ardabil near his father.[3] His son Khwādja Ali († 1429) succeeded him as leader of the Safaviyya.