Summary The present research aims to analyse the relevance of necessity in the context of international law of armed conflicts, clarifying its scope and the way in which it operates in this field of international law. The first part of the work focuses on necessity as a circumstance precluding wrongfulness, by analysing the relevant international practice and the codification work by the International Law Commission that led to the adoption of the 2001 Draft Articles on State Responsibility and of the 2011 Draft Articles on Responsibility of International Organizations. States and international organizations generally have the possibility to invoke necessity as a circumstance precluding wrongfulness of acts that would otherwise give ris...