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In the past two decades, regional organizations and coalitions of states have deployed more peace operations than the UN. Yet most quantitative studies of peacekeeping effectiveness focus on UN peacekeeping exclusively, a decision owed to data availability more than to theories about the differential impact of UN and non-UN missions. As a result, we know little about the effectiveness of non-UN peacekeeping in mitigating violence. In this paper, we introduce and analyse monthly data on the approximate number of troops, police, and observers in both UN and non-UN peacekeeping operations between 1993 and 2016. Using these data, we show that when accounting for mission size and composition, UN and regional peacekeeping operations are equally effective in mitigating violence against civilians by governments, but only UN troops and police curb civilian targeting by non-state actors. We offer some …