Al-Hasan bin Wahhas (d. February, 1285) was an imam of the Zaidi state in Yemen who ruled in 1258–1260.
The previous imam al-Mahdi Ahmad bin al-Husayn made a number of enemies among the Zaidi elite during his lifetime, which eventually resulted in his violent death in the Battle of Shuwaba in 1258.
Another claimant was Shams ad-Din Ahmad who formally submitted to the suzerainty of the Rasulid sultan, the main power in Yemen at this time.
In the same year, Shams ad-Din and two of his brothers succumbed to an epidemic, leaving al-Hasan bin Wahhas as the holder of the imamate.
While the imam's forces fled, al-Hasan remained fighting on the battlefield until taken prisoner.