Islamic Republic of Iran

The Islamic Republic of Iran is a nation of profound historical depth and strategic importance, situated in West Asia. Known for its ancient civilizations and influential empires, Iran blends a rich cultural heritage with a complex modern political structure. From the sprawling plains of the Iranian Plateau to the bustling metropolis of Tehran, the country remains a pivotal player in global energy and geopolitics.

Key Facts

A map of West Asia in 1872, with "Iran or Persia", ruled by the Qajar dynasty, shaded in pink.

Capital: Tehran (the largest city).
Official Language: Persian.
Government: Unitary presidential theocratic Islamic republic.
Population: Approximately 92.4 million (2025 estimate).
Economy: 26th largest GDP (PPP) globally, estimated at $1.783 trillion (2026).
Major Resource: Home to the South Pars Gas-Condensate field, the world's largest gas field.

Historical Evolution

Iran's history is marked by the rise and fall of some of the most powerful empires in human history. The journey began with early kingdoms, leading to the establishment of the Achaemenid Empire (550 BC), the first great Persian Empire.

The Achaemenid Empire, or the First Persian Empire, at its greatest extent

Following the Achaemenids, the Parthian and Sasanian Empires further solidified Persian influence. The Sasanian Empire, at its peak around 620 AD under Khosrow II, represented a golden age of pre-Islamic Persian culture.

The Sasanian Empire at its greatest extent c. 620, under the reign of Khosrow II

The Medieval and Early Modern Eras

The arrival of Islam transformed the region, leading to a period of Islamization and Persianization. Despite Mongol invasions and the subsequent rise of Timur, Iranian identity persisted through various dynasties. The Safavid Empire (1501–1722) was particularly influential, establishing Shia Islam as the official state religion and fostering a renaissance in art and architecture.

Safavid Iran (1501–1722) at its greatest extent

The Path to the Modern Republic

The 19th century saw the rule of the Qajar dynasty, followed by the Constitutional Revolution of 1905. The 20th century was dominated by the Pahlavi dynasty, which sought rapid modernization. This era ended abruptly with the Iranian Revolution of 1979, led by Ruhollah Khomeini, which replaced the monarchy with an Islamic Republic.

Ruhollah Khomeini returns to Iran after 14 years of exile in Turkey, Iraq and France on 1 February 1979.

Geography and Biodiversity

A map of Iranian dynasties in the mid 10th-century

Iran's topography is diverse, featuring rugged mountains and arid plateaus. This varied landscape creates a range of climates, as categorized by the Köppen climate classification system.

A Köppen climate classification map of Iran

The region is also home to unique wildlife, including the Persian leopard, a species native to the Iranian Plateau.

A Persian leopard, native to the Iranian Plateau

Government and Political Structure

Territory of the Khwarazmian Empire on the eve of the Mongol conquests, c. 1215

Iran operates under a unique theocratic system where religious authority overlaps with presidential governance. The Supreme Leader holds the highest authority, overseeing the state's general direction and the armed forces.

Ali Khamenei at the Great Conference of Basij members at Azadi Stadium, October 2018

The executive branch is led by the President, while the Islamic Consultative Assembly (ICA) serves as the legislative body. The Guardian Council ensures that legislation aligns with Islamic principles.

The building of the Islamic Consultative Assembly (ICA)

Military and Global Influence

Iran maintains a significant military presence and is recognized as a major missile power, possessing hypersonic missile technology. Its regional influence is often described through the "Axis of Resistance," a network of allied groups and states.

MRBM Sejjil. Iran is the world's 6th missile power, and the 5th country in the world with hypersonic missile technology

Economy, Science, and Infrastructure

Timur's empire and his military campaigns

The Iranian economy is heavily reliant on its energy sector. The South Pars Gas-Condensate field alone holds roughly 8% of the Earth's total gas reserves.

South Pars Gas-Condensate field, the world's largest gas field, holds 8% of Earth's gas reserves.[484]

Beyond energy, Iran has a robust industrial base, ranking as the world's 16th largest car manufacturer. In the realm of science, the Iranian Space Agency has achieved several milestones, including the launch of the Safir rocket.

Education and Health

Iran boasts a high standard of higher education, with the University of Tehran being the oldest and one of the most prestigious. The healthcare system is similarly advanced, featuring accredited facilities like the Razavi Hospital.

University of Tehran, the oldest Iranian university (1851), and among the world's top universities

Culture and Heritage

A map of the Afsharid Empire at its greatest extent, in 1741–1745

Iranian culture is a tapestry of ancient traditions and Islamic influence. The country is world-renowned for its architecture, from the ancient ziggurats like Chogha Zanbil to the intricate palaces of the Safavid era.

Chogha Zanbil is one of the few extant ziggurats outside of Mesopotamia and considered the best-preserved example in the world.

The arts flourish in weaving—exemplified by the Pazyryk Carpet, the world's oldest known surviving carpet—and in literature and poetry, with the tombs of Hafez serving as major cultural landmarks.

The Pazyryk Carpet, circa 400 BC, is considered world's the oldest known surviving carpet

Summary of Iran's National Profile
Category	Detail
Official Language	Persian
Main Ethnic Groups	Persians (61%), Azerbaijanis (16%), Kurds (10%)
Primary Religion	Islam (99.4%), predominantly Shia
Currency	Iranian rial (IRR)
Total Area	1,648,195 km²
HDI (2023)	0.799 (High)

Frequently Asked Questions

Iran under the Qajar dynasty in the 19th century.

Reza Shah with then-Crown Prince Mohammad Reza Pahlavi at Persepolis, c. 1939

The coronation of Mohammad Reza Pahlavi, the last Iranian coronation, held in 1967

Mohammad Reza Shah and Shahbanu Farah Pahlavi of Iran with US President Jimmy Carter and King Hussein of Jordan in 1977

An Iranian soldier with gas mask during the Iran–Iraq War

Ayatollah Ali Khamenei with Saudi Arabia's Defense Minister Khalid bin Salman and Major General Mohammad Bagheri on 17 April 2025

Former Supreme Leader Ayatollah Ali Khamenei with Pakistan's Prime Minister Shehbaz Sharif on 26 May 2025

Iranian President Masoud Pezeshkian (second from the right) poses for a group photo with other heads of state during the 16th BRICS summit in Kazan, Russia, on 23 October 2024

The entrance to the Presidential Administration palace in Pasteur Street, which is the cabinet's meeting place, and the President's office

Nations with which Iran has diplomatic relations

The building of the Ministry of Foreign Affairs, which extensively uses Achaemenid architecture in its facade, National Garden

Iran and its sphere of influence, known as the Axis of Resistance

The entrance to Evin Prison, established in 1972. VICE describes the prison as the "legendary terrifying place that nobody wants to end up."[397]

Around 12 million tourists visit Kish Island annually.[451]

Iran is the world's 16th largest car manufacturer, with IKCO being the largest in the Middle East, Central Asia and North Africa.[470]

Students of Amirkabir University of Technology in Tehran

Colour-coded map of Iran's ethnic groups

"I am Cyrus the king, an Achaemenid", in Old Persian, Elamite and Akkadian languages; Pasargadae, World Heritage Site

The Imam Reza shrine in Mashhad is the most sacred site in Iran and a major center of pilgrimage for Shia Muslims, containing the mausoleum of the eighth Imam.

Razavi Hospital, accredited by ACI[598] for its quality health services[599]

Kamal-ol-molk's Mirror Hall of Golestan Palace, often considered a starting point in Iranian modern art[606]

Chehel Sotoun Palace in Isfahan, built during the Safavid Empire with example of a talar, World Heritage Site

IRIB, the Iranian state-controlled media corporation

Chelow kabab (rice and kebab), one of Iran's national dishes

What is the role of the Supreme Leader in Iran?

The Supreme Leader is the highest-ranking political and religious authority in Iran, responsible for declaring war and peace, mobilizing the armed forces, and overseeing the general direction of the state.

Which is the largest gas field in the world?

The South Pars Gas-Condensate field, located in Iran, is the world's largest gas field and contains approximately 8% of the planet's gas reserves.

What are the primary ethnic groups in Iran?

The majority of the population are Persians (61%), followed by Azerbaijanis (16%), Kurds (10%), Lurs (6%), and smaller percentages of Arabs, Baloch, and Turkmen.

What is the significance of the Achaemenid Empire?

The Achaemenid Empire was the first great Persian Empire, established around 550 BC, and is noted for its vast extent and the administrative innovations of its kings, such as Cyrus the Great.

How is the Iranian government structured?

Iran is a unitary presidential theocratic Islamic republic. It features a dual system of governance consisting of an elected president and legislature, and an appointed religious leadership headed by the Supreme Leader.