Nurses are critical to deliver on the promise of “leaving no one behind” and the global effort to achieve the Sustainable Development Goals (SDGs). They make a central contribution to national and global targets related to a range of health priorities, including universal health coverage, mental health and noncommunicable diseases, emergency preparedness and response, patient safety, and the delivery of integrated, people-centred care. No global health agenda can be realized without concerted and sustained efforts to maximize the contributions of the nursing workforce and their roles within interprofessional health teams. To do so requires policy interventions that enable them to have maximum impact and effectiveness by optimizing nurses’ scope and leadership, alongside accelerated investment in their education, skills and jobs. Such investments will also contribute to the SDG targets related to education, gender, decent work and inclusive economic growth. This State of the world’s nursing 2020 report, developed by the World Health Organization (WHO) in partnership with the International Council of Nurses and the global Nursing Now campaign, and with the support of governments and wider partners, provides a compelling case on the value of the nursing workforce globally.