This article examines the effectiveness of UN peacebuilding missions in democratizing war-torn states, emphasizing those missions that include democracy promotion components in their mandates. Based on a multinominal logistic regression, we reveal that democratization is significantly more likely if a UN peacebuilding mission is deployed. Furthermore, regimes categorized as more liberal at the outset have an increased risk of revealing antidemocratization trends over the post-war period. Oil wealth impedes democratization and clear victory of one conflict party makes regime transitions more likely, yet in both directions. Descriptive statistics suggest that an increase in the mission’s capacities may be conducive to democratization.