To what extent does Islam help explain the dynamics of a participatory civil society in the post-Soviet Muslim-majority Central Asia? More specifically, to what extent does the variation in Islam (personal religiosity) and political Islam (support for Islam's role in politics) help predict the propensity to engage in elite-challenging collective political actions, rooted in self-assertive social capital? Grounded in emancipative social capital theory, this article embarks on an individual-level quantitative analysis to systematically examine the variation in self-assertive collective action in four Central Asian republics. This study contributes to a more nuanced understanding of the empirical nexus between general religiosity (Islam), Islamism (Political Islam), and elite-challenging collective actions and offers new clues on the empirical interactions between resurgent Islam and collective political participation in the post-Communist Muslim world. last years of the Soviet rule and the early post-communist period (Beissinger 2002, Cichock 2003, it is common wisdom that the currently depressed status of the region's civil society leaves much to be desired. However, there are several examples which underline the potential for development of a vibrant civil society and social capital mobilized for collective public good in the region. Memories of the historical Basmachi movement that slowed down the Soviet advance in the region; Moscow's ensuing suspicion that the region is explosive and unreliable; the Jeldoqsan protests in Alma-Ata, which forebore the end of the Soviet Union; two Tulip Revolutions in Kyrgyzstan; the protest alliance of "seemingly antithetical political forces", which included "pro-democracy movement" active in Dushanbe, religious forces, and supporters of an ex-communist leader, Nabiyev, in Tajikistan in opposition to the governing communist nomenklatura (Olcott 2005:45-46); and the active dissident diaspora are some of the examples, which underline the potential for development of a vibrant civil society and social capital mobilized for collective public good in the region. In this paper, we are using the cases of four Central Asian Republics (CARs) to examine our central question which addresses the influence of Islam on the formation of emancipative social capital, or selfassertive collective participation in mass political action. This question has relevance beyond the Central Asian region, both for the larger Islamic world and the areas where Muslims form significant minority populations.By building on Welzel et al.'s (2005) frame of emancipative social capital theory, this study probes the following questions: To what extent does variation in attachments to spiritual Islam (as a way of life), as well as politically motivated Islamism, help explain the likelihood of elite-challenging collective protests? To examine the extent to which the dynamics of self-assertive publics can be explained by variation in attachments to Islam and Islamism, this study embarks on a quantitative analysis of e...