Iraq serves as the spiritual heart of the Twelver Shiʿi Islamic world today.

Countries & Cities · Published 15 October 2026 Swipe more like this →

In short: While Iran is a prominent Shiʿi republic, Iraq remains the traditional physical and spiritual center of the faith. Home to the most significant holy cities and historic religious schools, the nation has shaped Islamic thought for centuries, navigating complex sectarian histories and evolving political landscapes to maintain its unique religious identity.

Iraq’s religious landscape is defined by its deep connection to the Twelver rite of Shiʿism. The cities of Najaf and Karbala stand as the two most vital pilgrimage sites for the faithful, while Kūfah is revered as the location where ʿAlī, the fourth caliph, was assassinated in the 7th century. Further north, Sāmarrāʾ holds immense cultural and religious importance as the site associated with the life and disappearance of the twelfth imam, Muḥammad al-Mahdī al-Ḥujjah.

The country has long functioned as a crossroads for religious scholarship. In premodern times, scholars moved fluidly between the Arab and Persian worlds, with many Iranian clerics teaching in the great madrasahs of Najaf and Karbala. The Najaf seminary, or hawza, traces its roots to the 11th century and remains a premier center for global Twelver scholarship. Unlike the Iranian model, the Najaf school has historically championed political quietism, suggesting that senior clerics should provide moral guidance while remaining detached from direct partisan involvement.

The social fabric of Iraq extends beyond its Shiʿi majority. Christian communities, including Nestorians and Chaldeans, descend from populations that predated the 7th-century arrival of Islam. Once numbering about one million at the start of the Iraq War, this population has declined to fewer than 250,000 due to violence and economic hardship. Similarly, the Jewish community, which traced its roots to the Babylonian Exile of 586–516 bce, largely departed following the rise of Zionism and the 1941 Farhūd pogrom. Today, these diverse threads of history continue to influence the nation's complex cultural and religious character.

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