أحمد بن زين الدين الأحسائي
Sayyid Kāẓim bin Qāsim al-Ḥusaynī ar-Rashtī (1793–1843) (), mostly known as Siyyid Kázim Rashtí (), was the son of Siyyid Qasim of Rasht, a town in northern Iran. He was appointed as the successor of Shaykh Ahmad al-Ahsa'i, and led the Shaykhí movement until his death.