This book discusses the legal responsibility of UN peacekeepers for the protection of civilians under international legal regimes, particularly international human rights law, international humanitarian law, international refugee law, and occupation law. It considers both negative and positive obligations, that is, a duty to respect or not violate a particular right directly and a duty to take positive action to secure or protect a particular right, respectively. In addition, it describes the standards and methods, as well as their strengths and weaknesses, by which actors in UN peacekeeping operations, including the UN, troop contributing countries, and individual peacekeepers, can be held accountable for third-party claims and allegations of criminal misconduct against UN peacekeepers for violations of responsibility in peacekeeping operations. The work will be a valuable resource for academics, researchers and policy-makers working in the areas of International Law, International Humanitarian Law, International Human Rights Law and International Relations.