This study shows that the personal statutes (šakhsīye-e ahvāl) of the officially recognised religious minorities (Zoroastrians, Jews and Christians), which are constitutionally guaranteed in Iran, grant them rights with regard to their personal affairs. Nevertheless, measures have been taken which, above all, affect the rights of religious minorities under international law according to Art. 27 of the IPCPR. This work is the first to deal with a legal comparison of these statutes. In addition, the author discusses the protection of religious minorities in international law, the legal status of religious minorities in Islamic law and, in detail, the legal status of religious minorities in Iran (including Sunnis, Sufi orders, Ahl-e Haq orders, Alevis, Zaidites, Ismailites, Zoroastrians, Jews, Christians, Baha'i, Mandaeans and Yezidis). The author offers solutions to the problems of religious minorities and contributes to the future harmonisation of Iranian law and international law.