The aim of this paper is to reflect on the role of non-governmental organizations in contemporary cities. It is assumed that post-socialist cities are subjected to changes related to new models of citizenship as well as new models of urban social movements. First, a general picture of Polish non-governmental sector is presented. Next the idea of social movements in a post socialist city is given. The following part presents the idea of NGO as agents of a social change.Th e notions of social conflict, common good and a collective identity are used. The paper sums up with conclusions and a demand to built coalitions between different social actors.