Shirazi was born in
Najaf,
Iraq. He hailed from the prominent religious
Shirazi family. His father was Sayyid Muhammad-Husayn Shirazi (d. 1955), the son of
grand Ayatollah Mirza Ali Agha Shirazi (d. 1936). His mother was the daughter of Sheikh Muhammad-Kadhim Shirazi (d. 1948). Shirazi is the eldest of eight siblings, four brothers and three sisters. Shirazi began his religious education at a young age in Najaf, studying under his grandfather Sheikh Muhammad-Kadhim Shirazi, Sayyid
Abu al-Qasim Khoei, Sheikh Husayn al-Hilli and Sheikh Baqir Zanjani. He then immigrated to Iran, and studied under Abul Hasan Sharani, Muhammad Taqi Amoli, Fazel Tooni, Mirza Ahmad Ashtiani, Shekh Mojtaba Lankarani,
Sayyid Abu al-Hasan Rafiee, and Mirza Mehdi Elahi Qomshehee. He gained ijtihad in 1953, being awarded permits by Sayyid Jamal al-Din Golpayegani, Sayyid
Abd al-Hadi Shirazi, Mirza Abu al-Hasan Rafiee, and Sheikh Muhammad-Husayn Kashif Ghitaa'. ==Religious career==