Grand Ayatollah Asadollah Bayat-Zanjani (born 1942 Zanjan; in Persian: اسدالله بیات زنجانی) is an Iranian theologian, Islamic philosopher, writer and Grand marja of Islam. He published his objection to the velayat-e faqih (religious system in Iran) and claims this regime has nothing to do with Islam .
He authored more than 10 books and is currently teaching Philosophy and Hekmat at Qom seminaries.
Before the 1979 Iranian revolution, Zanjani was a pro-democracy activist. In 1972 he was arrested and spent a year in prison. After the revolution, he was involved in the launching of the Islamic Republican Party. Zanjani was also a member of the committee to reassess the Iranian constitution. He was elected three times to Iranian parliament where he represented the city of Zanjan.