Belgium

Belgium has three official languages: French, Dutch and German. In Belgian schools the official two languages taught are French and Dutch, so the majority of Belgians are bilingual. Dutch (Flemish) is spoken in the Flemish communities, while French is spoken in Wallonia. In Brussels the most common language is French.

As a multilingual country there is a wide choice of language courses to learn French, Dutch, or German in the numerous language schools in Belgium, with the largest concentration of language schools in Brussels. 
Most of the universities have a Language Centre at which you can study French or Dutch courses as a foreign language. 

In Brussels, there are more than one hundred organisations offering language courses. Courses are offered by various organisations, including private language schools, municipalities, the Flemish and French-speaking Communities and the Chamber of Commerce.

Find on the site Commissioner.brussels a list of school and institutes providing language courses.