Muḥammad ibn Kiyā Buzurg-Ummīd (Persian: محمد بن کیا بزرگ امید) (1097) (February 20, 1162) He was the son of Kiyā Buzurg-Ummīd, and the third commander of the Alamūt Castle of the Nizari Ismaili state.
Upon the demise of Kiyā Buzurg-Ummīd on February 9, 1138, he was appointed as the commander of Alamūt by the third concealed Imam Hasan Al-Qāhir ibn Al-Muḥammad (القاهر) of the Nizārī Ismā'īlī State.