Iran, officially the Islamic Republic of Iran and historically known as Persia, is a country in West Asia. It borders Iraq to the west; Turkey, Azerbaijan, and Armenia to the northwest; the Caspian Sea to the north; Turkmenistan to the northeast; Afghanistan to the east; Pakistan to the southeast; and the Gulf of Oman and the Persian Gulf to the south. With a population of over 90 million, Iran ranks 17th in the world by both land area and population, making it the sixth-largest country in Asia. It is organized into five regions and 31 provinces. Tehran is the capital, largest city, and primary financial hub.
Iran is home to one of the world’s oldest continuously significant civilizations. Much of the Iranian plateau was first unified under the Medes in the 7th century BC, and Iran reached a major territorial peak in the 6th century BC with the rise of the Achaemenid Empire founded by Cyrus the Great. The empire was conquered by Alexander the Great in the 4th century BC, but Iranian rule later re-emerged through the Parthian Empire, which was succeeded in the 3rd century AD by the Sasanian Empire—a period often described as a high point in Iranian civilization. Ancient Iran also played an early role in the development of writing, agriculture, cities, religion, and state administration. Once a major center of Zoroastrianism, Iran became predominantly Islamic following the 7th-century Muslim conquest. Persian cultural and scientific life later flourished again during periods associated with the Islamic Golden Age and the Iranian Intermezzo, when Iranian dynasties helped revive the Persian language and reduce Arab political dominance. Subsequent centuries included Seljuk and Khwarazmian rule, Mongol invasions, and the Timurid Renaissance from roughly the 11th to 14th centuries.
In the 16th century, the Safavids reunified Iran and made Twelver Shi’a Islam the state religion, shaping the foundations of the modern Iranian state. Iran was a major regional power under the Afsharids in the 18th century, but its influence declined after the Qajars took power in the 1790s. The early 20th century brought the Persian Constitutional Revolution, followed by the rise of the Pahlavi dynasty in 1925 under Reza Shah. After the Anglo-Soviet invasion in 1941, his son Mohammad Reza Pahlavi became shah. Efforts by Prime Minister Mohammad Mosaddegh to nationalize Iran’s oil industry culminated in a 1953 Anglo-American-backed coup. The 1979 Iranian Revolution then toppled the monarchy and established the Islamic Republic, led initially by Ruhollah Khomeini. In 1980, Iraq’s invasion triggered the Iran–Iraq War, which lasted eight years and ended without a decisive victory. In later decades, Iran became involved in regional proxy conflicts, and in June 2025 Israeli strikes reportedly escalated tensions into what was described as the Twelve-Day War, followed by renewed unrest amid economic strain and large protests in late December 2025.
Iran is governed as an Islamic theocracy with a combination of elected and unelected institutions, but ultimate authority rests with the supreme leader. Although elections are held, key positions—particularly at the highest levels of the state and military—are not determined by direct public vote. The country has been widely criticized internationally for its human rights record, including limits on freedom of expression, assembly, and the press, and for its treatment of women, minorities, and political opponents. Observers have also questioned the competitiveness of elections due to candidate vetting by unelected bodies such as the Guardian Council.
Economically, Iran features extensive state involvement and planning alongside a private sector. It is often described as a middle power because of its large oil and natural gas reserves, strategic location, and central role in global Shi’a Islam. Iran is also a threshold state with a heavily scrutinized nuclear program that it says is for civilian use; however, the International Atomic Energy Agency (IAEA) has cited Iran for non-compliance with safeguards obligations on more than one occasion. Iran is a founding member of the United Nations, participates in numerous international organizations, and has 29 UNESCO World Heritage Sites, ranking highly in recognized intangible cultural heritage.
Name
In much of the Western world, Iran was long referred to as “Persia,” and “Persian” was commonly used as a general label for Iranian nationals. In 1935, Reza Shah Pahlavi asked foreign governments to use the name “Iran” in official correspondence. Later, in 1959, Mohammad Reza Pahlavi indicated that both “Iran” and “Persia” were acceptable in formal usage. Some scholars interpret the shift as more than a naming preference—seeing it as an assertion of national identity rooted in deep historical continuity.

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