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- Internationalism (politics)
- Political international, any transnational organization of political parties having similar ideology or political orientation
- First International (1864–1876), known as the International Workingmen’s Association, founded in London in 1864
- Second International (1889–1916), founded after the expulsion of Anarchists from the First International, and a direct ancestor of the Socialist International
- Third International (1919–1943), known as the Communist International or Comintern, founded by Vladimir Lenin
- Fourth International (1938-), founded by Leon Trotsky in opposition to the corruption of the Comintern by Stalinism
- Socialist International (1951-), founded as the Labour and Socialist International (1919–1940), and refounded as the Socialist International in 1951
- Fifth International, a widely mooted but never established successor to the previous Internationals
- Liberal International, the political international federation for liberal political parties
- Centrist Democrat International, the Christian Democrat International