The United Nations Organization Stabilization Mission in the Democratic Republic of the Congo or MONUSCO, an acronym based on its French name Mission de l'Organisation des Nations Unies pour la stabilisation en République démocratique du Congo, is a United Nations peacekeeping force in the Democratic Republic of the Congo (DRC) which was established by the United Nations Security Council in resolutions 1279 (1999) and 1291 (2000) to monitor the peace process of the Second Congo War, though much of its focus subsequently turned to the Ituri conflict, the Kivu conflict and the Dongo conflict. The mission was known as the United Nations Mission in the Democratic Republic of Congo or MONUC, an acronym of its French name Mission de l'Organisation des Nations Unies en République démocratique du Congo, until 2010.

Peacekeeping by the United Nations is a role of the UN's Department of Peace Operations as an "instrument developed by the organization as a way to help countries torn by conflict to create the conditions for lasting peace". It is distinguished from peacebuilding, peacemaking, and peace enforcement although the United Nations does acknowledge that all activities are "mutually reinforcing" and that overlap between them is frequent in practice.