French-speaking media, when covering Brussels’ political events, especially on the occasion of (much mediatised) inter-community conflicts, regularly mention the Flemish authorities’ will to (re)conquer Brussels, if not a true « flemishisation » of the city. The article tries to clarify this question empirically, using different « indicators » on the Flemish presence in Brussels. The analysis of migration moves between Flanders, Wallonia and Brussels over the last 20 years shows the Dutch-speaking population in Brussels is not on the increase. Consequently, other elements have to be found to explain this feeling of a growing Flemish presence. A deeper study of migrations shows a concentration of migrations from Flanders in Brussels centre. This is also true of Flemish Community investments in a range of fields. Rather than a true « flemishisation » of Brussels, one can note a growing visibility of the Flemish community, not only as a population group but also as political institution. The « flemishisation myth » takes root in this increased visibility, but equally in French speakers’ reaction to this visibility. The article also examines the different forms the Flemish institutions’ presence can take in the urban space, particularly in the cultural field, which in Brussels represents meaningful stakes.