The Constitution of the Islamic Republic of Iran mandates that the official religion of Iran is Shia Islam and the Twelver Ja'fari school, though it also mandates that other Islamic schools are to be "accorded full respect", and their followers are free to act in accordance with their own jurisprudence in performing their religious rites.

The Islamization of Iran began with the Muslim conquest of Iran, when the Rashidun Caliphate annexed the Sasanian Empire. It was a long process by which Islam, though initially rejected, eventually spread among the Persians and the other Iranian peoples.

3 days ago · Iran - Religion, Islam, Shia: The vast majority of Iranians are Muslims of the Ithnā ʿAsharī, or Twelver, Shiʿi branch, which is the official state religion. The Kurds and Turkmen are predominantly Sunni Muslims, but Iran’s Arabs are both Sunni and Shiʿi.

3 days ago · On April 1, following overwhelming support in a national referendum, Khomeini declared Iran an Islamic republic. Elements within the clergy promptly moved to exclude their former left-wing, nationalist, and intellectual allies from any positions of power in the new regime, and a return to conservative social values was enforced.

Mar 14, 2025 · Today, Iran is known for being the epicenter of Shi'ite Islam. However, this shift only happened in the 16th century. Before that, Persia was mostly Sunni Muslim.

Islam was brought to Iran via Arab-Islamic conquest in 650 AD and has played a shifting, anomalous role in this nation-state ever since. The ideas of nationalism, secularism, religion, and revolution are unique in this Muslim country.

Apr 1, 2016 · The coming of Islam to the Iranian plateau and the westerly regions of Central Asia wrought a permanent and profound transformation in the religious, cultural, and social life of the Iranian world. Pre-Islamic Iran had been marked by a great profusion of religions, indigenous and imported, and although Zoroastrianism had generally prevailed ...

Islam in Iran is the majority religion as most of the Iranian population is Shia Muslim. The Muslim conquest of Persia (637-651) led to the end of the Sassanid Empire and the eventual decline of the Zoroastrian religion in Persia.

Sep 1, 2024 · Discover how Iran transitioned from a Sunni stronghold to the heart of Shia Islam, driven by historical events like the rise of the Safavid Dynasty and the Islamic Golden Age.

Iran is an Islamic republic. Its constitution mandates that the official religion is Islam (see: Islam in Iran), specifically the Twelver Ja'fari school of Islam, with other Islamic schools being accorded full respect.