Mehdi Haeri Yazdi (Persian: مهدی حائری یزدی ; Arabic: المهدي الحائري اليزدي; al-Ḥa’irī̄ al-Yazdī̄; b. 1923, Qom, Sublime State of Persia – 9 July 1999, Tehran, Iran) was an Iranian philosopher and Shia Islamic cleric. He was the first son of Sheikh Abdul Karim Haeri Yazdi, the founder of Qom Seminary and teacher of Ayatollah Ruhollah Khomeini, who became the leader of the Iranian Revolution and founder of the Islamic Republic of Iran.