Seyed Reza Hosseini Nassab (Persian: سيد رضا حسيني نسب) (born 1960) is an Iranian Twelver Shi'a Marja,[1][2][3] currently residing in Canada.

Hosseini Nassab was born in Yazd, Iran and studied at the Islamic seminary in Qom.

It is necessary to respect the gender equality of men and women in law and rights.

However, the ruling on covering the hair of a Muslim woman based on the Quranic verses and Islamic narrations was one of the Islamic governmental rulings to differentiate the free Muslim woman from the non-free maid in a certain period of time when the system of slavery was still in place.

"[13] Hosseini Nassab has written more than 160 books and treatises about Islamic theology, Shia faith, philosophy, jurisprudence and logic.