The provision of life-saving assistance to people affected by armed conflict lies at the heart of humanitarian actors’ operations... and the Geneva Conventions of 1949 and their Additional Protocols of 1977 lay down rules regulating humanitarian relief operations. Despite this, until recently, this area of international humanitarian law has received limited attention, possibly because challenges in implementing relief operations tend to be operational rather than legal in nature. In 2013, in response to the refusal of some belligerents to allow relief to reach people in extreme need, the United Nations Secretary-General requested the UN Office for the Coordination of Humanitarian Affairs (OCHA) to examine the relevant rules and consider options for guidance. In turn, OCHA commissioned the Institute for Ethics, Law and Armed Conflict at the University of Oxford to convene a series of consultation of legal experts. These led to the elaboration of the Oxford Guidelines on the Law Regulating Humanitarian Relief Operations in Situations of Armed Conflict: a document that restates existing law, and clarifies areas of uncertainty. It considers key elements of this area of law, including the question of whose consent is required to conduct relief operations; the circumstances in which withholding consent would be arbitrary; the rules on the implementation of relief operations; and the consequences of unlawful impeding of relief operations. The Guidance can be assessed at the following link: https://www.law.ox.ac.uk/content/oxford-guidance-law-relating-humanitarian-relief-operations-situations-armed-conflict