The Islamic Republic of Iran, commonly known as Iran or historically as Persia, is a sovereign nation-state in West Asia and the Middle East. Spanning approximately 1.648 million square kilometers, it is the 17th largest country by area globally and the sixth-largest in Asia, with a population exceeding 90 million, making it the 17th most populous nation. Iran borders Iraq and Turkey to the west, Armenia, Azerbaijan, and the Caspian Sea to the north, Turkmenistan to the northeast, Afghanistan and Pakistan to the east, and the Persian Gulf and Gulf of Oman to the south. The country is administratively divided into five regions comprising 31 provinces, with Tehran serving as the capital, largest city, and economic hub. Iran's diverse landscape includes mountains, deserts, and coastlines, supporting a rich cultural heritage influenced by ancient Persian civilizations, while its economy relies on oil and gas exports, agriculture, and services.

Established following the 1979 Iranian Revolution that overthrew the Pahlavi monarchy, Iran is a theocratic republic governed by Islamic principles under the Guardianship of the Islamic Jurist (Velayat-e Faqih). The Supreme Leader, currently Ayatollah Ali Khamenei since 1989, holds ultimate authority over state affairs, including the military, judiciary, and foreign policy, as enshrined in Article 5 of the 1979 Constitution (amended in 1989). The President, elected every four years, manages executive functions but is subordinate to the Supreme Leader. The unicameral Islamic Consultative Assembly (Majlis) legislates, subject to review by the Guardian Council. Key institutions include the Ministry of Intelligence and Security (VAJA), responsible for internal and external intelligence, and state-controlled media like the Islamic Republic News Agency (IRNA).

As a major regional power, Iran has exerted significant influence in the Middle East. It is often at odds with U.S. and Israeli interests due to its nuclear program, missile development, and support for proxy groups like Hezbollah and Hamas. During the Syrian Civil War, it provided extensive military, financial, and logistical support to the Assad regime, including deploying Islamic Revolutionary Guard Corps (IRGC) advisors and coordinating with Shia militias. This involvement has drawn accusations from Western nations of human rights abuses, sponsorship of terrorism, and destabilizing activities. Iran faces international sanctions, particularly from the United States, which has labeled it a 'dangerous regime.'

Domestically, Iran grapples with economic challenges from sanctions, protests over governance and women's rights, and allegations of corruption within its clerical and military elite. Despite these, Iran maintains strategic alliances with Russia, China, and Shia militias across Iraq, Lebanon, and Yemen, positioning it as a counterweight to Sunni-led states and U.S. interests.