Third Force (Persian: نیروی سوم, romanized: Niru-ye sevvom) was a loosely organized[5] non-aligned political movement[1] in Iran which advocated an independent, socialist–nationalist philosophy of development.

[4] The group was established in 1948 as a breakaway split from the communist Tudeh Party of Iran, when they rejected the party's Stalinism and pro-soviet oil concession stance in favor of democratic socialism and centrist Marxism, supporting nationalization of the Iran oil industry movement.

Third Force split from the party in October 1952, after they positioned against Government of Mosaddegh.

[6] According to leader Khalil Maleki, the group functioned through two basic principles, being a "Third Force in general", meaning to pursue an independent path from Western and Eastern blocs; and a "Third Force in particular", i.e. application of the third way in local circumstances.

[5] In 1960, it was merged into the League of Socialists of the National Movement of Iran.