Charleroi (Walloon: Tchålerwè) is the largest city and municipality of Wallonia, located in the province of Hainaut, Belgium. On January 1, 2006, Charleroi had a total population of 201,300. The agglomeration has a population of around 500,000. The inhabitants are called Carolorégiens or simply Carolos.

The municipality features an industrial area, iron and steel industry, glassworks, chemicals, and electrical engineering. Charleroi is in the center of a vast coal basin, called Pays noir. Many slag heaps still surround the city.