Confederación Nacional del Trabajo

The Confederación Nacional del Trabajo (English: National Confederation of Labor; CNT) is a Spanish confederation of anarcho-syndicalist labor 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 (English: Iberian Anarchist Federation, FAI); 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. Despite several decades when the organization was illegal in Spain, the CNT continues to participate in the Spanish worker's movement, focusing its efforts on the principles of workers' self-management, federalism, and mutual aid.

The union's disaffiliation from the AIT in 2016 led to the emergence of a rival CNT that continues to be associated with the AIT, known as the CNT-AIT. In 2018, the CNT founded the International Confederation of Labor (ICL-CIT) with other unions and former AIT members.