League Against Imperialism and Colonial Oppression

The League Against Imperialism and Colonial Oppression (French: Ligue contre l'impérialisme et l'oppression coloniale; German: Liga gegen Kolonialgreuel und Unterdrückung) was a transnational anti-imperialist organisation in the interwar period. It has also been referred to as the League of Oppressed People, and the World Anti-Imperialist League, or simply and confusingly under the misnomer Anti-Imperialist League.

It was established in the Egmont Palace in Brussels, Belgium, on 10 February 1927, in presence of 175 delegates from around the world. It was significant because it brought together representatives and organisations from the communist world, and anti-colonial organisations and activists from the colonised world. Out of the 175 delegates, 107 were from 37 countries under colonial rule. The Congress aimed at creating a "mass anti-imperialist movement" at a world scale. The organisation was founded with the support of the Communist International (Comintern). Since 1924, the Comintern advocated support of colonial and semi-colonial countries and tried, with difficulties, to find convergences with the left-wing of the Labour and Socialist International and with bourgeois anti-colonial nationalist parties from the colonised world. Another stimulus to create a cross-political cooperation was the revolutionary surge in China since 1923, in which the nationalist Kuomintang was in a united front with the Chinese Communist Party (CCP).

According to Indian Marxist historian Vijay Prashad, the inclusion of the word "league" in the organisation's name was a direct attack on the League of Nations, which perpetuated colonialism through the mandate system.

At the 1955 Bandung Conference, Sukarno credited the League as the start of an eventually successful worldwide movement against colonialism.