
Alternative libertaire was a French anarchist organization formed in 1991 which publishes a monthly magazine, actively participates in a variety of social movements, and is a participant in the Anarkismo.net project. In 2019 the organization changed its name to Union Communiste Libertaire

Central Organisation of the Workers of Sweden is a syndicalist trade union federation in Sweden. Unlike other Swedish unions, SAC organises people from all occupations and industries in one single federation, including the unemployed, students, and the retired. SAC also publishes the weekly newspaper Arbetaren, owns the publishing house Federativs and runs the unemployment fund Sveriges Arbetares Arbetslöshetskassa (SAAK).

The Confederación Nacional del Trabajo is a Spanish confederation of anarcho-syndicalist labour unions, which was long affiliated with the International Workers' Association (AIT). When working with the latter group it was also known as CNT-AIT. Historically, the CNT has also been affiliated with the Federación Anarquista Ibérica ; thus, it has also been referred to as the CNT-FAI. Throughout its history, it has played a major role in the Spanish labor movement.

The Iberian Anarchist Federation is a Spanish organization of anarchist militants active within affinity groups in the Confederación Nacional del Trabajo (CNT) anarcho-syndicalist union. It is often abbreviated as CNT-FAI because of the close relationship between the two organizations. The FAI publishes the periodical Tierra y Libertad.

The International Alliance of Socialist Democracy was an organisation founded by Mikhail Bakunin along with 79 other members on October 28, 1868 as an organisation within the International Workingmen's Association (IWA). The establishment of the Alliance as a section of the IWA was not accepted by the central committee of the IWA because international organisations were not allowed to join. The Alliance dissolved shortly afterwards and the former members instead joined their respective national sections of the IWA.

The International Union of Anarchists (IAU) was a group of international anarcho-communist organisations. The IAU had national organisations in Ukraine, Russia, Israel, Latvia, Belarus and Spain, individual members in Germany and Sweden, and links to anarchists in Bulgaria, Kazakhstan, Lithuania, France, Tunisia and Syria.

The Iraq Freedom Congress is a libertarian socialist, progressive, democratic, and secularist group. The Congress was formed in March 2005 by labor groups, women's groups, students, and neighborhood groups concerned about sectarian violence, Ba'athism, Islamism, and nationalism, as well as the post-war occupation.

The Kurdistan Communities Union is a Kurdish political organization committed to implementing Abdullah Öcalan's ideology of democratic confederalism. The KCK also serves as an umbrella group for all the democratic confederalist political parties of Kurdistan, including the Kurdistan Workers' Party (PKK), Democratic Union Party (PYD), Kurdistan Free Life Party (PJAK), and Kurdistan Democratic Solution Party (PÇDK).

Libertære Socialister was a Danish political left-wing organization which was founded on November 8, 2009, at its third initial meeting in Horsens. The organisation was working on the political ground of an anti-capitalist, revolutionary and libertarian socialist platform. LS had local groups in Copenhagen, Aalborg and Odense and these groups were linked together in a federation, which was described in details the organization's rules.

The Iberian Federation of Libertarian Youth, sometimes abbreviated as Libertarian Youth, is a libertarian socialist organisation created in 1932 in Madrid. It exists to this day.
Socialisme ou Barbarie was a French-based radical libertarian socialist group of the post-World War II period whose name comes from a phrase which was misattributed to Friedrich Engels by Rosa Luxemburg in The Junius Pamphlet, but which probably was most likely first used by Karl Kautsky. It existed from 1948 until 1967. The animating personality was Cornelius Castoriadis, also known as Pierre Chaulieu or Paul Cardan. Socialisme ou Barbarie is also the name of the group's journal.

Socialist Youth Front is a socialist political youth organisation in Denmark, consisting of 1,500 members distributed between 35 autonomous local groups.

The Workers' Initiative is a Polish anarcho-syndicalist trade union. IP was established in the second half of 2001 as an informal anarchists group whose objective was the common struggle for workers' rights. As a formal nationwide anarcho-syndicalist trade union IP began to act in September 2004.

The Zapatista Army of National Liberation, often referred to as the Zapatistas, is a libertarian socialist political and militant group that controls a substantial amount of territory in Chiapas, the southernmost state of Mexico.

