The National Labor Secretariat (Dutch: Nationaal Arbeids-Secretariaat, NAS) was a trade union federation in the Netherlands from 1893 to 1940.

In the late 1880s and early 1890s the idea that trade unions should no longer be branches of the Social Democratic League (SDB), as they had been up to this point, became increasingly influential.

The financial shortage that resulted from this as well as increasing anarchist tendencies in the NAS soon led many of the larger unions to leave the organization.

Cornelissen, who was influenced by the French syndicalism of the CGT developed a syndicalist theory adapted to the local orientation of the NAS.

Under his leadership, the NAS was able to broaden its base by emphasizing its political and religious neutrality and its membership doubled to 7,200 by 1913.

About 8,000 members left to found the IWA-affiliated Dutch Syndicalist Trade Union Federation (NSV).

After the NAS had seceded from the RILU, it was reaching to the German revolutionary trade-unions and the international revolutionary-syndicalism, which opposed soviet politics.

As a counterpart of the communist network of unions, the NAS founded additional organizations and an innate political party, the RSP, in 1929.

In the 1930s the NAS also started turning its back on syndicalism arguing that the idea that the workers should build up a socialist society themselves had failed.