This joint contribution interrogates the postcolonial relations that are at play in the Congolese political sphere in Belgium, the former colonial metropolis. Two lines of argument are developed. First, the politicisation of the postcolonial relations, which pre-dates the Congolese immigration to Belgium, is viewed from a historical perspective. Second, the highly competitive political pluralism, as observed since the early 2000s, is examined. After having restored historically the constitution and the reconstruction of this political sphere, wherein new technologies deepen the transnational movements, the authors will examine the tensions that arise from the unifying dynamics of the politically engaged Diaspora, on the one hand, and its intrinsic logics of division and fragmentation, on the other. The postcolonial issues that are at stake are to be seen on different levels: transnational, local, within the Diaspora, and between the Congolese minority and the Belgian majority. Their interconnectedness further reveals the postcolonial character of this political sphere.