Renardism (French: Renardisme) refers to a political ideology in Belgium based on the thinking of the trade union leader André Renard (1911–62) which is generally considered to have emerged as a concept only in the years after his death. Although its exact nature has been much discussed, Renardism combined elements of syndicalism and regionalist politics which ultimately sought the transformation of the country into a federal state.
Renard's political ideas attracted a following within the FGTB and the Walloon Movement and outlived his own death. A staunch populist, inspired by Trotskyism and anarcho-syndicalism, Renard aimed to use industrial action to achieve structural reform which would provide greater autonomy to Wallonia and improve the situation of the working class. He strongly advocated federalism.