1953 coup in Iran, coup d’état in Iran that occurred in August 1953. Funded by the United States and the United Kingdom, it removed Mohammad Mosaddegh from power and restored Mohammad Reza Shah Pahlavi as Iran’s leader. Some 300 people died during fighting in Tehrān.
With its strategic location and vast oil reserves, Iran was of special interest to the United States, the United Kingdom, and other powers. Britain had established a presence in the country during World War II to protect a vital supply route to its ally the Soviet Union and to prevent the oil from falling into German hands. After the war, the United Kingdom effectively retained control over Iran’s oil through the establishment of the Anglo-Iranian Oil Company.
This arrangement changed abruptly in 1951 when the Iranian parliament, led by Mosaddegh’s nationalist and democratically elected government, voted to nationalize the country’s oil industry. Seeing its interests thus threatened, the UK embarked on a secret campaign to weaken and destabilize Mosaddegh. At first the British government tried to convince the shah to remove Mossadegh from office by engineering a parliamentary decree, a ploy that both failed and enhanced Mosaddegh’s reputation while diminishing the shah’s. When the push to remove Mosaddegh evolved into the idea of a coup to overthrow the government, Britain, reluctant to shoulder the responsibility alone, persuaded the U.S. to join forces by playing on Cold War fears that Mosaddegh, an avowed anticommunist, was aligning himself with Tudeh, the Iranian Communist Party.
The United States took the leading role in a covert operation, called Operation Ajax, whereby CIA-funded agents were used to foment unrest inside Iran by way of the harassment of religious and political leaders and a media disinformation campaign. These efforts, formally approved by President Dwight D. Eisenhower. came to a head in August 1953 when Mosaddegh and his government were overthrown and Mohammad Reza, a pro-Western monarch, was returned to power. The coup nearly failed, however, because the shah, fearful for his throne, vacillated over signing the royal decrees the CIA had prepared to sanction the change of government. Fighting between supporters of both sides resulted in hundreds of deaths.
Mosaddegh was imprisoned for three years and then lived the rest of his life under house arrest. It is generally agreed today that the 1953 coup sowed the seeds for the Islamic Revolution of 1979, in which the shah was overthrown and went into exile. In 2013 the CIA formally disclosed its role in the coup.