The Socialist Party is a social democratic French-speaking political party in Belgium. As of the 2019 elections, it is the third largest party in the Belgian Chamber of Representatives and the largest Francophone party. The party is led by Paul Magnette. The party supplies the Minister-president of the French Community, and the Brussels-Capital Region. In the German-speaking community, the party is known as the Sozialistische Partei (SP).

In Belgium, the French Community refers to one of the three constituent constitutional linguistic communities. Since 2011, the French Community has used the name Wallonia-Brussels Federation, which is controversial because its name in the Belgian constitution has not changed and because it is seen as a political statement. The name "French Community" refers to Francophone Belgians, and not to French people residing in Belgium. As such, the French Community of Belgium is sometimes rendered in English as "the French-speaking Community of Belgium" for clarity, in analogy to the German-speaking Community of Belgium.