The article examines the affective potential of populist civilizational discourse. It reflects on two prevalent, opposing, civilizational identities to render visible their shared fantasmatic grounding. With reference to far right and Islamist configurations, the article aims to reveal the hidden and disguised elements of civilizational discourse that I contend give it affective power. Drawing on populist theory that centralizes antagonism in social identification, it examines the use of civilizational discourse in the performances of far right and Islamist parties, organizations, and individuals. I argue these civilizationist identities are defined by an obsession with a fantasmatic closure and homogeneity of social identities and civilization.