Peacebuilding is more likely to succeed in countries with higher levels of gender equality, but few studies have examined the link between subnational gender relations and local peace and, more generally, peacebuilding after communal conflict. This article addresses this gap. I examine gender relations and (non)violence in ethno-religious conflict in the city of Jos in central Nigeria. Jos and its rural surroundings have repeatedly suffered communal clashes that have killed thousands, sometimes within only days. Drawing on qualitative data collected during fieldwork, I analyze the gender dimensions of violence, nonviolence, and postviolence prevention. I argue that civilian agency is gendered. Gender relations and distinct notions of masculinity can facilitate or constrain people’s mobilization for fighting. Hence, a nuanced understanding of the gender dimensions of (non)violence has important implications for conflict prevention and local peacebuilding.