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Based on the example of Luxembourg, this article deals with the integration of metropolitan cross-border spaces, focusing on the articulation of their institutional and functional properties. Firstly, it questions the functional evolution of the metropolitan area. By taking into account the intensity of commuting flows, the objective is to show the existence of a cross-border metropolitan functional area. Secondly, the article examines the initiatives undertaken in the field of institutional integration by the political actors. The Luxembourg case then makes it possible to show that, contrary to other European metropolitan centres and in a paradoxical way, there is no cross-border metropolitan governance likely to cope with the functional issues. This singular situation results from the dominating role of the State – rather than the City – of Luxembourg in the process of metropolitanisation.