Persians are the dominant ethnic group in Iran, constituting approximately 50–60% of the population and providing the cultural, linguistic, and political framework of the modern state. The Persian language — Farsi — is the sole official language of the Islamic Republic, the medium of education at all levels, and the language of government, law, and media. Persian literary culture, stretching from the Shahnameh of Ferdowsi through the poetry of Rumi, Hafez, and Saadi to modern literature, represents one of the world's great continuous literary traditions and remains a source of profound national pride across ethnic lines.

Persian identity is not monolithic — significant regional variations exist between the Tehranis of the capital, the Isfahanis of the central plateau, the Khorasanis of the northeast, and the Shirazi culture of Fars province. Urban secular Persians have frequently been at the forefront of Iran's democratic and civil rights movements, including the Constitutional Revolution, the 1979 Revolution, the 2009 Green Movement, and the 2022 Woman Life Freedom uprising.

Azerbaijanis are the largest ethnic minority in Iran and the second-largest ethnic group overall, constituting an estimated 20–25% of the total population. They speak a Turkic language closely related to — but distinct from — the Azerbaijani spoken in the Republic of Azerbaijan to the north. Unlike many of Iran's Sunni minorities, Iranian Azerbaijanis are predominantly Shia Muslim, which has historically afforded them greater integration into the Islamic Republic's political framework; several prominent figures in the revolution and subsequent government, including Supreme Leader Ali Khamenei, are of Azerbaijani origin.

Despite this relative integration at the elite level, Azerbaijani cultural rights have been systematically denied. The Azerbaijani language is not taught in schools, publication in Azerbaijani is restricted, and cultural activists advocating for linguistic rights have been arrested and imprisoned. A vibrant civil society movement for Azerbaijani cultural rights has persisted for decades, periodically expressed in large-scale street protests — most notably in 2006, when hundreds of thousands demonstrated after a government newspaper published a cartoon widely seen as depicting Azerbaijanis as cockroaches.

The Kurds of Iran form part of the larger Kurdish people distributed across Turkey, Iraq, Syria, and the diaspora — together constituting the world's largest stateless ethnic group, with an estimated 30–40 million people. Iranian Kurds are primarily Sunni Muslim, which places them in a double minority position — ethnically non-Persian and religiously non-Shia — within the Islamic Republic's framework. Kurdish political aspirations for autonomy or independence have deep historical roots: the short-lived Republic of Mahabad in 1946 remains a foundational symbol of Kurdish national consciousness.

Kurdish society in Iran is organized around tribal structures, though urbanization has significantly altered social patterns in recent generations. Kurdish literary and cultural production — in Kurmanji, Sorani, and Gorani dialects — is rich and historically significant, but formal education in Kurdish is prohibited in Iran. Kolbars — Kurdish cross-border traders who carry goods on their backs across mountain passes due to lack of economic alternatives — are frequently shot by border guards in documented killings that human rights groups characterize as extrajudicial executions.

Iranian Arabs are concentrated primarily in Khuzestan Province in southwestern Iran — a region known to the Arab world as Arabistan or Ahvaz — which sits atop the majority of Iran's oil and gas reserves. This coincidence of Arab demographic majority and extraordinary hydrocarbon wealth has made Khuzestan a site of particular strategic sensitivity for the Islamic Republic, and its Arab population has been subjected to intense surveillance, political suppression, and economic marginalization. The disproportion between Khuzestan's resource wealth and the poverty of its Arab population is among the starkest examples of structural ethnic discrimination in Iran.

Khuzestani Arab culture is rooted in tribal structures, agricultural and fishing traditions along the Karun and Arvand rivers, and a rich oral literary tradition expressed in the Arabic dialect of the region. The 1980–1988 Iran-Iraq War devastated Khuzestan — which bore the brunt of the fighting — destroying infrastructure and displacing hundreds of thousands of Arab civilians whose reconstruction needs were subsequently deprioritized by a government that viewed them with political suspicion.

The Baloch of Iran inhabit Sistan-Baluchestan — the country's largest province by area and its poorest by almost every socioeconomic measure. Baloch communities span the Iran-Pakistan-Afghanistan tri-border region, and the Baloch people as a whole number approximately 10–15 million across these three countries, with no state of their own. In Iran, the Baloch occupy a uniquely disadvantaged position: they are Sunni rather than Shia, ethnically non-Persian, geographically peripheral, and economically marginalized in a province with some of the highest rates of poverty, malnutrition, child mortality, and unemployment in the country.

Baloch cultural life is organized around tribal structures, nomadic and semi-nomadic pastoralism, and a rich tradition of oral poetry and music. The Balochi language has a significant literary tradition but is entirely absent from formal education in Iran. Economic desperation has made many young Baloch men vulnerable to recruitment by armed groups or to the dangerous trade of fuel smuggling across the Pakistan border — a trade in which border guards have killed hundreds of documented civilians in recent years.

The Turkmen of Iran inhabit the Turkmen Sahra — the steppe and semi-arid plains along the Caspian Sea's southeastern shore and the border with Turkmenistan — and represent the westernmost extension of the Turkmen people whose majority lives in the Republic of Turkmenistan. Iranian Turkmen are organized into tribal confederations including the Yomut and Teke, each with distinct dialect variations, carpet-weaving traditions, and customary governance practices. Turkmen carpet weaving — featuring bold geometric patterns in deep reds and burgundies — is among the most recognized art forms of the Turkic world and remains an important livelihood for many Turkmen women.

The Turkmen are Sunni Muslim, which places them outside the Shia framework of the Islamic Republic's ideal citizen. The Turkmen Sahra experienced significant armed resistance immediately following the 1979 Revolution, with Turkmen political organizations demanding autonomy before being suppressed by Revolutionary Guard operations. Land confiscations — taking collectively managed tribal grazing land for state agricultural projects — dispossessed many Turkmen communities in the early revolutionary period, and the economic consequences have persisted across generations.

The Lurs are a western Iranian people whose language — Luri — is closely related to Persian and Bakhtiari, forming a dialect continuum across the Zagros mountain range. They are divided into several sub-groups including the Bakhtiari (sometimes classified separately), the Mamasani, the Boyer-Ahmad, and the Kohgiluyeh, each with distinct tribal identities and territorial bases in the high mountain valleys of western Iran. Luri culture is deeply pastoral, organized around transhumant herding traditions in which tribes move their flocks seasonally between summer highland pastures and winter lowland grazing areas — a way of life that the Pahlavi government sought to eradicate through forced sedentarization.

As Shia Muslims speaking a language closely related to Persian, the Lurs occupy a more integrated position in the Islamic Republic's ethnic hierarchy than Sunni or Turkic minorities. However, Luri-speaking regions — particularly Lorestan — remain among Iran's most economically underdeveloped provinces, with high rates of poverty, unemployment, drug addiction (a legacy of proximity to opium transit routes), and environmental degradation caused by dam construction on the Zagros rivers that has flooded ancestral Luri villages and disrupted pastoral livelihoods.

Armenians have been present in Iran for over two thousand years, with a significant community established in Isfahan's Jolfa quarter by Shah Abbas I in the early seventeenth century — forcibly relocated from the Armenian city of Julfa in the Araxes valley as skilled artisans, merchants, and silk traders whose expertise the Safavid economy required. This history of both coerced migration and relative privilege has characterized Armenian experience in Iran across the centuries: a recognized and valuable community, but one whose status has always depended on the calculations of the ruling power rather than on rights-based protection.

Under the Islamic Republic, Armenians are recognized as a protected religious minority under Article 13 of the constitution, with two reserved seats in the Majles and the right to operate Armenian-language schools and churches. In practice this recognition coexists with significant restrictions — the proselytization ban effectively prevents Christians from sharing their faith with Muslims, conversion from Islam to Christianity is punishable by death, and Armenian community institutions operate under close government surveillance. The population has declined sharply through emigration since 1979.

The Assyrians of Iran are among the oldest continuous inhabitants of the region — descendants of the ancient civilizations of Mesopotamia and the northern Fertile Crescent, speaking dialects of Neo-Aramaic directly descended from the language of the ancient Assyrian Empire. Their presence in northwestern Iran, particularly around Lake Urmia, dates back millennia. They are one of the most severely diminished minority populations in the country, having experienced devastating losses during the Seyfo — the Assyrian genocide of 1914–1918 — followed by continued displacement and emigration throughout the twentieth century.

Like Armenians, Assyrians are constitutionally recognized as a religious minority with a reserved Majles seat. Their community institutions — churches, schools, cultural organizations — operate under constant constraint. The Assyrian language is taught in community schools but has no official status. The community's most urgent challenge is demographic survival: emigration has reduced the Assyrian population in Iran from an estimated 100,000 in 1979 to a fraction of that today, with communities in Urmia, Tehran, and smaller towns continuing to shrink through outmigration to the diaspora.

Jews have lived in Iran for over 2,700 years — among the oldest continuous Jewish communities in the world, predating the destruction of the First Temple and the Babylonian exile from which many of their ancestors may have been liberated by Cyrus the Great, whose Achaemenid decree permitting Jewish return to Judea is recorded in the Hebrew Bible. Iranian Jewish civilization produced its own distinct literary tradition in Judeo-Persian — Persian written in Hebrew script — and a cultural synthesis unique in the Jewish world. At the time of the 1979 Revolution, Iran's Jewish community numbered approximately 80,000–100,000.

The Islamic Republic's constitutionally recognized protection of Jews as a religious minority coexists with a state ideology of virulent anti-Zionism that makes the position of Iranian Jews structurally precarious. Jewish Iranians are prohibited from holding senior government or military positions, face restrictions on employment in the judiciary and other state institutions, and live under the constant threat of being associated — however wrongly — with Israel's government in a state whose official ideology calls for Israel's elimination. The community has declined catastrophically through emigration to approximately 8,000–15,000 today.

The Bahais are Iran's largest non-Muslim religious minority and its most severely persecuted. The Bahá'í Faith originated in Iran in the mid-nineteenth century from within Shia Islam — a fact that the Islamic Republic treats not as a mark of connection but as the gravest aggravation, since the Bahá'í claim to a prophetic revelation after Muhammad is considered apostasy under the Islamic Republic's interpretation of Islamic law. Unlike Christians, Jews, and Zoroastrians, Bahais have no constitutional recognition, no legal standing, and no protection from the full force of the state's religious persecution apparatus.

Bahais are excluded from universities, prohibited from government employment, barred from practicing many professions, and subject to having their businesses closed and their properties confiscated. Their cemeteries have been bulldozed, their community centers demolished, their marriages not legally recognized, and their dead denied burial in Iranian cemeteries. Over 200 Bahais were executed in the first decade after the Revolution. Since 1979, thousands have been imprisoned, and the community's informal educational system — the Bahá'í Institute for Higher Education (BIHE), created because Bahai students are banned from universities — has been repeatedly raided and its teachers imprisoned.

The Yarsanis — followers of the Yarsan or Ahl-e Haqq tradition — practice one of Iran's most distinctive and least understood indigenous religious traditions, a syncretic faith rooted in Kurdistani spiritual culture that incorporates elements drawn from Shia Islam, Zoroastrianism, and older animist traditions. Yarsan theology centers on the concept of divine manifestation across successive human forms, the sanctity of music as a vehicle for spiritual experience, and a strong esoteric tradition transmitted through initiated masters. The use of the sacred lute (tanbur) in Yarsan ritual has made the instrument a symbol of the tradition and of Kurdish spiritual identity more broadly.

Yarsanis occupy a legally ambiguous and practically dangerous position in Iran. The Islamic Republic does not recognize Yarsan as a legitimate religion — followers are classified as Muslims by the state regardless of their own self-identification, which means they are subject to Islamic law's most severe penalties for apostasy if they publicly identify as Yarsani rather than Muslim. Yarsani community members who have sought civil status recognition, pursued legal marriages within their tradition, or publicly practiced their faith have faced arrest, harassment, and in documented cases, violence.