The purpose of this article is to do a sociological study of mosque focusing on mosque discourses in contemporary Iran. Our major question is how we can demonstrate mosque in the context of modern Iranian society? To examine this question I analyze mosques discourse to contextualize the institution of mosque in its historical, social, cultural and political grounds. So, we do not examine the mosque from religious knowledge and perspectives. By mosque discourses, I mean all different theories, conceptions and knowledge on mosque. These mosque discourses are produced according to given historical time and conditions, and are presented in the works and ideas of scholars, clerics, writers, media and press. In this study, I have classified all mosque discourses into four categories including traditional, secular, revolutionary ideological and critical ideological discourses. These are the dominant mosque discourses in contemporary Iran. Based on this study, I have examined and identified some of problems and challenges of the institution of mosque in today Iran. The last section of this article presents a methodological approach to study mosque.