The paper analyses the class basis of the civil society in Serbia in the period of post-socialist transformation. The analysis is based on data from several empirical studies implemented by the Institute for Sociological Research of the Faculty of Philosophy in Belgrade over the past twenty years, specifically in 1997, 2007 and 2012. The main objective of the analysis is to determine whether there is rootedness of civil society activities among the middle class. The basic hypothesis of the paper is that members of the middle class are the key actors of civil society in the entire period observed. Results of the analysis show that the members of the middle class have been holders of civil protests during the period of blocked transformation - almost the only phenomenal manifestation of the civil society in Serbia in the 1990s. On the other hand, research findings from 2007 and 2012 indicated a significant decline of civic activism among all social groups, and the decline was most marked precisely among the middle class. Although members of the middle class, compared with other social groups, were still more willing to engage in civic activities, data show that the differences between social classes were not especially marked, and therefore we can talk only conditionally about rootedness of civil society activities among the middle class.