Città e spazio nel pensiero di Maurice Hallbwachs - City and Space in Maurice Halbwachs’ thought, In Italy as well as in France, Maurice Halbwachs is still considered a specialist of collective memory and little attention is paid to his theoretical contributions to European urban sociology. Nevertheless, a great part of Halbwachs’s reflection was centred on the development of the city, particularly on the spatial dimension of social facts. The aim of the present essay is therefore to reconstruct the development of Halbwachs’s thought on city and space by a close examination, in chronological order, of his major writings on these subjects. We shall thus analyse the main research steps which have taken Halbwachs from the study of social morphology to a more and more accurate definition of space as a sociological category. Key words: social morphology, city, Maurice Halbwachs.