The Yearbook contains documentary materials of a legal character concerning the United Nations and related intergovernmental organizations (IGOs). The present volume covers activities in 2015 and contains: legislative texts and treaties, or provisions thereof, concerning the legal status of the UN and related IGOs; a general overview of the legal activities of the UN and related IGOs; selected treaties concerning international law concluded under the auspices of the organizations concerned; selected decisions of administrative tribunals of the UN and related IGOs; selected legal opinions of the UN and related IGOs; a list of judgments, advisory opinions and selected decisions rendered by international tribunals; selected decisions of national tribunals relating to the work of the UN and related IGOs.