Iran Nationalizes Its Oil Industry

In 1951, Iran's parliament voted to nationalize the country's oil industry, and Prime Minister Mohammad Mosaddegh moved to seize the holdings of the Anglo-Iranian Oil Company (AIOC), a firm largely owned by the British government. The decision challenged one of Britain's most valuable overseas assets and became an early, influential example of a postcolonial state asserting control over its natural resources. It also set off a confrontation that ended with Mosaddegh's overthrow two years later.

The roots of the crisis lay in a concession granted in 1901 to the British investor William Knox D'Arcy, after which oil was discovered in southwestern Iran in 1908. The company that grew from it, later renamed the Anglo-Iranian Oil Company, ran the vast Abadan refinery and supplied the Royal Navy and the British economy with cheap fuel. Many Iranians resented the arrangement. They saw the royalties they received as small compared with the company's profits, objected to the secrecy of its accounts, and criticized the poor housing and wages of Iranian oil workers. Negotiations in the late 1940s over a revised agreement, including the so-called Supplemental Agreement, were seen by many in Iran as inadequate. Around the same time, the American-Saudi arrangement in Saudi Arabia, which split profits roughly equally, raised expectations.

Mosaddegh, a veteran nationalist politician and leader of the National Front, championed the cause. After the prime minister Ali Razmara, who had opposed nationalization, was assassinated in March 1951, the parliament passed the nationalization law, and Mosaddegh became prime minister in the spring. A new National Iranian Oil Company took over operations, and British technicians eventually left the country.

Britain responded forcefully. It withdrew its staff, brought the dispute to the International Court of Justice and the United Nations Security Council, and imposed an effective boycott on Iranian oil, backed by a naval presence in the Persian Gulf. Other Western companies largely declined to buy or ship Iranian oil, and Iran's revenues collapsed. The economic strain contributed to political turmoil at home, where Mosaddegh clashed with the young shah, Mohammad Reza Pahlavi, and with some former allies.

In August 1953, a coup removed Mosaddegh from power. It was organized with the involvement of British and American intelligence services, a role the United States government later acknowledged. The shah's authority was strengthened, and a consortium of foreign firms, including American companies, took a major share in Iranian oil production under a 1954 agreement, though ownership nominally remained with Iran. The episode left a lasting mark on Iranian views of Western intervention and was often cited in later debates over resource nationalism, including the wave of nationalizations across the oil-producing world in the 1960s and 1970s.