This article theorizes on how military and civilian components of peacekeeping operations contribute to the conclusion of local ceasefires in non-state conflicts involving armed opposition groups or communal groups. A mediation-based logic suggests that civilian peacekeeping staff can provide technical support aimed at resolving the conflict issues and engage with state officials to promote peace. A capabilities-based logic suggest that military peacekeepers can provide security during the negotiations, arrange logistics, and put military pressure on the conflict parties, which all should make the conclusion of a ceasefire more likely. The analysis supports both the capabilities-based and the mediation-based logic. An instrumental variable estimation helps to account for endogeneity. This article contributes to the literature on peacekeeping, mediation, and ceasefires through shifting the focus to non-state conflicts.