"The Internationale" is an international anthem that has been adopted as the anthem of various anarchist, communist, socialist, democratic socialist, and social democratic movements. It has been a standard of the socialist movement since the late nineteenth century, when the Second International adopted it as its official anthem. The title arises from the "First International", an alliance of workers which held a congress in 1864. The author of the anthem's lyrics, Eugène Pottier, an anarchist, attended this congress. Pottier's text was later set to an original melody composed by Pierre De Geyter, a Marxist.

The International Workingmen's Association (IWA), often called the First International (1864–1876), was an international organisation which aimed at uniting a variety of different left-wing socialist, social democratic, communist and anarchist groups and trade unions that were based on the working class and class struggle. It was founded in 1864 in a workmen's meeting held in St. Martin's Hall, London. Its first congress was held in 1866 in Geneva.