Confederación Nacional del Trabajo

The Confederación Nacional del Trabajo is a Spanish confederation of anarcho-syndicalist labor unions, which was long affiliated with the International Workers' Association. 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.

Founded in 1910 in Barcelona from groups brought together by the trade union Solidaridad Obrera, it significantly expanded the role of anarchism in Spain, which can be traced to the creation of the Spanish chapter of the IWA in 1870 and its successor organization, the Federation of Workers of the Spanish Region.