Syedna Qasim-Khan Zainuddin was the 31st Dai of the Dawoodi Bohras (died on 23 Jumadil Akhir 1054/56 AH/August 25(?) 1646 CE in Ahmedabad, India). He succeeded the 30th Dai Syedna Ali Shamsuddin to the religious post.
Syedna Zainuddin became Da'i al-Mutlaq in 1056 AH/1646 AD. His period of Dawat was 1042âÂÂ1054 AH/1634âÂÂ1646 AD. He served five of his predecessors.
Syedna Qasim-Khan's ancestry is traced back to Maulaya Abdullah and Syedi Hasan Feer.
He is buried in Mazar-e-Qutbi in Ahmedabad.