lol. you know what the speak in belgium? french.
From Wikipedia:
Straddling the cultural boundary between Germanic and Latin Europe, Belgium is home for two main linguistic groups, the Flemings and the French-speakers, mostly Walloons, plus a small group of German-speakers. Belgium's two largest regions are the Dutch-speaking region of Flanders in the north, with 59% of the population, and the French-speaking southern region of Wallonia, inhabited by 31%. The Brussels-Capital Region, officially bilingual, is a mostly French-speaking enclave within the Flemish Region and has 10% of the population.[5] A small German-speaking Community exists in eastern Wallonia.[6] Belgium's linguistic diversity and related political and cultural conflicts are reflected in the political history and a complex system of government.[7][8]
So yes they speak French, but a larger part of the population speaks Dutch (Flemish is a Dutch language dialect).