In 2023, the World Health Organization was responding to 72 health emergencies, including 19 grade-3 emergencies which required the highest level of activation, reaching millions of people. The annual report on WHO’s response to health emergencies in 2023 outlines the increasingly critical role of WHO at global, regional and country levels, and across the key elements of effective emergency response, including emergency coordination and planning, operational and logistic support, and community engagement and protection. The huge scale and complexities of health emergencies in the 21st century require a strategic shift towards not only meeting the immediate needs of vulnerable communities, but also building community and health system resilience to all hazards – a challenge that both WHO and its partners must continue to meet.