The Confederation of Christian Trade Unions (, or ACV; , CSC) is the largest of Belgium's three trade union federations.
The federation was founded in 1904, but can trace its origins to the "Anti-Socialist Cotton Workers' Union" founded in 1886. The organisation took its current name in 1923.
Today the ACV/CSC has 22 regional federation and 16 sectoral unions, with a membership of 1.7 million (almost 16% of the total Belgian population). The president is currently and the secretary general is Marie-Hélène Ska.
The union's affiliates are: