The inefficient operation of state institutions – including municipal administration – lay at the heart of Belgium's crisis of legitimacy in the 1930s. In 1940, the German military occupation government opted to keep many of the existing administrative institutions and personnel in place. The collaborating political parties, Rex and the Vlaams Nationaal Verbond (VNV), possessed little legitimacy with either the Germans or the Belgian population. However, this article argues that both parties turned this to their advantage, infiltrating the Flemish municipal apparatus (especially mayors). Yet, as their political programme and legitimation was completely derived from the Germans, their legal position as administrators (especially mayors) was very weak. Both collaborating parties compensated for this with the theory of ‘good government’. Their takeover of power was an administrative operation which, the article argues, would bring them legitimacy through everyday ‘good government’. The entire ‘Neuordnung’ in Belgium in 1940–2 was strongly legitimised on administrative, not political grounds. The failure of this tactic lay in the open politicisation of collaborationist local government. As the article shows, the post-liberation authority also faced a problem of legitimacy. Generally speaking, the trauma of occupation had seemed to strengthen Belgians' wishes for the restoration of stability rather than reforms.