The general strike of 1960-1961 (French: Grève générale de 1960-1961), known popularly in Wallonia as the Strike of the Century (Grève du Siècle), was a major series of strikes in Belgium which began on 14 December 1960 and lasted approximately six weeks. The strike was instigated by the militant trade union, the General Labour Federation of Belgium (Fédération Générale du Travail de Belgique, or FGTB; Algemeen Belgisch Vakverbond, ABVV), against an attempt by the government of Gaston Eyskens to improve the state of Belgium's public finances by introducing a series of austerity measures known as the Unitary Law (Loi Unique or Eenheidswet). It has been described as "one of the most serious class confrontations in Belgium's social history", which brought out 700,000 workers out on strike. Although the strike began across Belgium, it soon lost momentum in Flanders where workers returned to work after a few days. The strike continued in Wallonia, a region largely reliant on heavy industry and already starting to experience deindustrialization, for several weeks. The law was eventually passed on 14 February 1961.
The strike is considered a key moment for the Walloon Movement and an influence on the formation of Walloon identity. It led to the foundation of a new ideology of Renardism which linked Walloon nationalism with syndicalism. The strike also led to the creation of the pro-federalist Walloon Popular Movement (Mouvement Populaire Wallon, MPW) in 1961 and an increasing polarization between Flemish and Walloons which culminated, from the late 1960s, in the "Linguistic Wars" and, ultimately, in Belgium's gradual transformation into a federal state.
The 1983 film Winter 1960 is based on the strike. The strike was the subject of the documentary film Lorsque le bateau de Léon M. descendit la Meuse pour la première fois (1979) by the Dardenne brothers.