The Tudeh Party of Iran (Persian: حزب توده ایران, translit. Hezb-e Tudeh Iran, lit. "Party of the Masses of Iran") is an Iranian communist party. Formed in 1941, with Soleiman Mohsen Eskandari as its head, it had considerable influence in its early years and played an important role during Mohammad Mosaddeq's campaign to nationalize the Anglo-Iranian Oil Company and his term as prime minister. The crackdown that followed the 1953 coup against Mosaddeq is said to have "destroyed" the party, although it continued. The party still exists, but is much weaker as a result of the banning of the party and mass arrests by the Islamic Republic in 1982 and the executions of political prisoners in 1988.
The party has generally been described as "communist" by historians (for example: "The Tudeh Party was a classical pro-Soviet Union communist party, but wrapped itself at the time in nationalism to be more attractive to Iranians"), but is sometimes described simply as "leftist" or even "left-leaning" by more sympathetic sources.