This study examines the practice of ethnic communities in Bosnia and Herzegovina flying a state, entity, religious, or foreign flag at wedding ceremonies in public spaces. The wedding custom is analyzed through the lens of Hannah Arendt’s discussion of the way nationalism in the modern era links family and state. After a tragic war, flag power in this context appears to exacerbate nationalism and ethnic tensions in a polyethnic society trapped in a dysfunctional state structure created by the Dayton Accords. The empirical study finds that flag power does not, in fact, privilege ethnic solidarity over national solidarity to the degree that social and political theory would have us imagine. The national identity of being Bosnian is more likely to be exemplified. A clustered, stratified, random sample of 2,500 subjects over the age of eighteen was drawn from the country’s population, including the two entities, Federation of Bosnia and Herzegovina and Republika Srpska and Brčko District. Survey questions involving face-to-face structured questions asked participants whether flags were flown at their weddings, which flags were flown, and attitudes toward the wedding custom. Variations by age, religiosity, education, ethnicity, type of flag flown, and political party affiliation are reported and interpreted.