Political international
trans-national organization of political parties having similar ideology or political orientation
International Socialist Tendency
Centrist Democrat International
European Anti-Capitalist Left
International Revolutionary Marxist Centre
Committee for a Workers' International
Socialist International
Communist International
International Workingmen's Association
International League of Peoples' Struggle
Second International
Revolutionary Internationalist Movement
World Union of National Socialists
Fourth International
Christian Democrat Organization of America
Liberal International
International Communist Seminar
International Meeting of Communist and Workers' Parties
International Alliance of Libertarian Parties
World Ecological Parties
Fifth International
Fourth International
International Working People's Association
Communist Workers' International
Humanist International
Union of Latin American Parties
Global Greens
Africa Liberal Network
International Workers League – Fourth International
Alliance of Democrats
International Coordination of Revolutionary Parties and Organizations
Progressive International
International Conference of Marxist–Leninist Parties and Organizations (Unity & Struggle)
International Conference of Marxist–Leninist Parties and Organizations
International Working Union of Socialist Parties
Labour and Socialist International
Progressive Alliance
International Democrat Union