| Yahya al-Mu`tasim | |
| Almohad Caliph | |
| Reign: | 1227–1229 |
| Full Name: | Abū Zakarīyā' Al-Mu`taṣim Yaḥyā ibn An-Nāṣir |
| Predecessor: | Abdallah al-Adil |
| Successor: | Idris al-Ma'mun |
| Birth Date: | unknown date |
| Death Date: | 1236 |
| Religion: | Islam |
Yahya al-Mu`tasim (Arabic: أبو زكرياء المعتصم يحي بن الناصر; Abū Zakarīyā' Al-Mu`taṣim Yaḥyā ibn An-Nāṣir; died 1236) was an Almohad rival caliph[1] who reigned from 1227 to 1229. He was a son of Muhammad al-Nasir[2] and brother of Yusuf II, Almohad caliph.
At the death of his uncle Abdallah al-Adil, Yahya was supported by the sheikhs of Marrakesh, but two years later he was turned down by another pretender, his other uncle Idris al-Ma'mun. At the latter's death in 1232, Yahya renewed his pretenses, but his cousin Abd al-Wahid II was preferred to him. He was anyway able to keep Marrakesh until his death in 1236, after which the Almohad territories were again united under Abd al-Wahid.