The People's Mojahedin Organization of Iran (PMOI), also known as Mojahedin-e-Khalq (MEK) , Mojahedin-e-Khalq Organization (MKO)(Persian: سازمان مجاهدین خلق ایران, romanized: Sâzmân-e Mojâhedin-e Khalgh-e Irân), or simply Mojahedin, is an Iranian leftist dissident political organization. It is one of the main political actors among Iranian opposition groups opposing the Islamic Republic of Iran government as well as the Iranian monarchy.
Its headquarters is currently in Albania. The group's ideology was influenced by Islam and revolutionary Marxism; and while it denied Marxist influences, its revolutionary reinterpretation of Shia Islam was shaped by the writings of Ali Shariati. After the Iranian Revolution, the MEK opposed the new theocratic Government of the Islamic Republic of Iran, seeking to replace it with its own government. At one point the MEK was Iran's "largest and most active armed dissident group", and it is still sometimes presented by Western political backers as a major Iranian opposition group.