United Nations peace operations promote stability and security in some of the world’s most dangerous and fragile places. Before the COVID-19 pandemic, overstretched UN peacekeepers—civilian, military, and police—were a thin blue line helping to protect civilians, support peace agreements and contain conflicts in hot spots and war zones across the globe. If—or more likely when—the COVID-19 virus further spreads in countries already weakened by war and poverty, it will not only threaten the lives of the thousands, but could also tip the balance from tenuous peace back to conflict and despair.