Iran operates as an Islamic Republic where Twelver Shia Islam holds constitutional status as the official state religion. Approximately 90 to 95 percent of Iran's population identifies as Shia Muslim, making Iran the world's largest Shia-majority nation. The remaining 5 to 10 percent consists of Sunni Muslims concentrated in border provinces including Kurdistan, Sistan-Baluchestan, and Golestan, alongside constitutionally recognized religious minorities: Zoroastrians, Jews, and Christians. The 1979 Constitution allocates fixed parliamentary seats to these recognized minorities: two for Armenian Christians, one for Assyrian and Chaldean Christians collectively, one for Zoroastrians, and one for Jews. Baha'is, the largest non-Muslim minority with an estimated 300,000 adherents, receive no constitutional recognition and face systematic legal restrictions including denial of access to university education and formal employment in government sectors.
The Supreme Leader, a position held by Ali Khamenei since 1989, functions as the highest religious and political authority under the doctrine of velayat-e faqih, or guardianship of the Islamic jurist. This constitutional structure places religious law above civil legislation. The Guardian Council, consisting of six clerics appointed by the Supreme Leader and six jurists nominated by the judiciary and approved by parliament, reviews all legislation for compliance with Islamic law and vets candidates for elected office. Friday prayers in major cities serve dual functions as religious observance and political messaging, with government-appointed imams delivering sermons that address both spiritual matters and state policy. The Ministry of Culture and Islamic Guidance enforces regulations governing public morality, media content, and cultural production.
Daily life in Iran follows rhythms established by Islamic practice and state enforcement of religious norms. The five daily prayer times structure schedules in government offices, though private sector adherence varies by workplace and region. Businesses close briefly for noon prayers in traditional bazaars and religious cities like Qom and Mashhad, while Tehran's commercial districts maintain more flexible schedules. The call to prayer sounds from mosques five times daily in all urban areas. Government employees and students in state schools observe prayer times with designated spaces provided in institutional buildings. Many Iranians maintain prayer schedules privately at home rather than in mosques, particularly in larger cities where secular lifestyles coexist with religious observance.
Gender segregation operates as legal requirement in specific public contexts. Universities maintain separate entrances and seating sections for men and women in lecture halls and libraries, though classrooms themselves often mix genders during instruction. Public buses in cities including Tehran designate rear sections for women, front sections for men, with enforcement varying by route and time of day. Subway systems operate women-only cars during rush hours. Public beaches along the Caspian Sea and Persian Gulf maintain separate sections or separate days for male and female swimmers. Wedding celebrations typically feature separate halls or separate hours for male and female guests, with mixed dancing prohibited in public venues. Private homes host mixed-gender gatherings where social norms differ significantly from public spaces, particularly in urban middle-class households.
The Islamic dress code requires women to cover hair and body contours in public spaces. The law mandates hijab for all women over age nine, enforced through morality police units known as Gasht-e Ershad, or Guidance Patrols. These units operate in Tehran, Isfahan, Shiraz, and other major cities, issuing warnings or fines for improper hijab. Following the death of Mahsa Amini in morality police custody in September 2022, enforcement patterns shifted, with visible patrols decreasing in Tehran and several other cities during late 2022 and 2023. Urban areas demonstrate wide variation in hijab styles, ranging from loosely draped scarves showing significant hair in north Tehran neighborhoods to full chadors covering entire bodies in Qom and south Tehran. Rural areas and smaller cities generally observe more conservative dress standards. Men face fewer clothing restrictions, though shorts remain uncommon in public spaces outside sports facilities and coastal resort areas. Ties carry political connotations as Western symbols and rarely appear except in specific business contexts.
Alcohol prohibition operates under Islamic law with possession, production, and consumption illegal for Muslim citizens. Non-Muslims may produce limited quantities for personal religious use, specifically wine for Christian communion. Penalties for alcohol offenses include 80 lashes for consumption, though enforcement focuses primarily on production and distribution networks rather than private consumption. Home production of beer and spirits occurs widely in urban areas despite legal prohibition. Police conduct periodic raids on suspected production sites and parties serving alcohol, with arrest rates increasing before Persian New Year celebrations and other major holidays when consumption rises. Restaurants and hotels serve no alcoholic beverages. Some foreign visitors report confusion about enforcement inconsistency, as private consumption in homes rarely draws police attention while public consumption or transportation of alcohol containers creates arrest risk.
Dietary practices follow Islamic halal requirements in all commercial food service. Pork remains entirely prohibited with no legal sales anywhere in Iran. Meat must come from animals slaughtered according to Islamic method, with certification required for butcher shops and restaurants. Supermarkets stock no pork products or alcohol. International hotel chains operating in Iran including Espinas Palace Hotel and Parsian Azadi Hotel in Tehran serve only halal meat and alcohol-free beverages. During Ramadan, which follows the lunar calendar and shifts approximately eleven days earlier each year, Muslims fast from dawn to sunset for thirty days. Restaurants in most cities close during daylight hours or operate behind covered windows. Tehran's northern neighborhoods and tourist areas including Isfahan maintain some open restaurants serving non-Muslims and travelers, though visibility remains reduced. Evening iftar meals breaking the fast create busy restaurant scenes from sunset through late evening. Non-Muslims face no legal requirement to fast, but eating visibly in public during Ramadan daylight hours draws social disapproval and occasional police intervention.
Religious holidays follow the Islamic lunar calendar for Shia observances and the solar Persian calendar for pre-Islamic celebrations. Muharram, the first month of the Islamic calendar, centers on mourning ceremonies for Imam Hussein, killed at the Battle of Karbala in 680 CE. The tenth day of Muharram, known as Ashura, brings large public processions in all Iranian cities. Participants dressed in black walk through streets while some practitioners perform ritual chest-beating or chain-flagellation, practices more common in traditional neighborhoods and smaller cities. Mashhad, Qom, and south Tehran host the largest Ashura processions, some drawing hundreds of thousands of participants. Mobile vendors distribute free food and drinks to marchers. These events create significant traffic disruptions in city centers. Arbaeen, occurring forty days after Ashura, prompts millions of Iranian pilgrims to travel to Karbala in Iraq, with official estimates indicating over two million Iranian participants in recent years crossing through Mehran and Shalamcheh border points.
Nowruz, the Persian New Year beginning at the spring equinox around March 20, functions as Iran's most widely celebrated holiday across all religious and ethnic communities. The thirteen-day celebration predates Islam by over 2,500 years, originating in Zoroastrian tradition. Families prepare haft-seen tables displaying seven items beginning with the letter 'S' in Persian: sabzeh (wheat or lentil sprouts), samanu (sweet wheat pudding), senjed (dried oleaster fruit), seer (garlic), seeb (apple), somaq (sumac), and serkeh (vinegar). Additional items include painted eggs, goldfish in bowls, hyacinth flowers, mirrors, and candles, each carrying symbolic meaning related to rebirth and prosperity. The exact moment of the spring equinox, calculated astronomically and announced nationally, marks the new year arrival when families gather around haft-seen tables. The thirteenth day, Sizdah Bedar, requires spending time outdoors to avoid bad luck, sending millions of Iranians to parks, riversides, and rural areas for picnics. Tehran's Chitgar Lake, Darband hiking area, and Mellat Park fill beyond capacity on Sizdah Bedar. The entire country essentially closes for at least one week, with many businesses shuttered for two weeks.