Cardinal Clemente Micara has been papal nuncio in Belgium from 1923 until 1946. The aim of this article is to show the influence of this prelate on the Belgian political life. This research is essentially based on the correspondance that nuncio Micara exchanged with the late cardinal Van Roey, primate of Belgium. The Holy See ignored the «Flemish question» and Msgr. Micara confirmed his superiors in this position.