The Atomic Energy Organization of Iran (AEOI) is the main Iranian government agency responsible for operating nuclear energy and nuclear fuel cycle installations in Iran. AEOI is the primary organization responsible for nuclear technology research and development activities in Iran. AEOI was involved in formerly undeclared nuclear activities including enrichment facilities at Fordow and Natanz.

AEOIs headquarters are in the northern Amir Abad district in Tehran, but it has facilities throughout the country. The current head of AEOI is Mohammad Eslami, who replaced Ali Akbar Salehi on 29 August 2021.