ABSTRACT To overcome ethno-national segregation, conflict resolution practitioners have promoted consociational power-sharing. After power-sharing arrangements were instituted, to address women’s under-representation in parliaments legislated gender quotas were also introduced. Gender quotas have been adopted in many post-conflict settings, but their effects remain understudied. In this article, by combining consociationalism and gender quotas theory, and applying a feminist institutionalist analytical approach, we examine the disparate effectiveness of gender quotas in two consociations: Bosnia and Herzegovina and North Macedonia. We pair the two countries to evaluate why gender quotas have produced different outcomes and demonstrate that formal and informal institutions matter for quota effectiveness.