Introduction

Abstract Two hundred seventy-four million people-one in thirty people on the planet-are in humanitarian need as of September 2022.1 More than one hundred million of these individuals are displaced, usually as a result of crisis: conflict, political upheaval, economic meltdown, or climate shocks.2 In a humanitarian crisis, health is the most urgent and paramount need. But today the system for preventing and addressing humanitarian crisis is failing, and with it, the health needs of millions of vulnerable people are under threat. From treating childhood acute malnutrition to delivering COVID-19 vaccines to ensuring access to sexual, reproductive, maternal, and newborn health, health care in humanitarian contexts requires a dramatic rethink amid growing challenges to access and service delivery.