Ṣalāḥ al-Dīn al-Malik al-Nāṣir Aḥmad ibn Ismāʿīl, numbered al-Nāṣir Aḥmad I, was the eighth Rasūlid sultan of Yemen from 1400 until his death. He succeeded his father, al-Ashraf Ismāʿīl I, and was succeeded by his son, al-Manṣūr ʿAbdallāh.