In this chapter Spies focuses on third-party diplomacy, a mode that involves conflict management, reduction and resolution. Third-party diplomacy speaks to the very raison d’etre of diplomacy, because it hinges on the principle of brokerage, or intermediation that underpins the institution of diplomacy. The chapter explores the notion of neutrality and explores various third-party methods, including good offices, arbitration, mediation and conciliation. The troubled evolution of peacekeeping is discussed, and the broader management of conflict is contextualised within the changing profile of global peace and conflict. Spies explains the nuanced concept of peacebuilding, and the implications of long-term, multi-stakeholder ‘project management’ of peace processes. She also addresses the ethical dilemma that faces diplomats when a political settlement is prioritised over judicial closure.