Aims: The World Health Organization (WHO) Health Emergency Programme funded three systematic reviews to inform development of guidance for emergency preparedness in health emergencies. The current review investigated the type of learning interventions that have been developed and used during health emergencies, and how they were developed. Methods: We searched PubMed, CINAHL, Communication and Mass Media Complete (EBSCO), and Web of Science. Study quality was appraised by WHO-recommended method-specific checklists. Findings were extracted using a narrative summary approach. Results: 187 studies were included. Studies were split between online, in-person, and hybrid modalities, conducted mostly by hospitals and universities, and most frequently training nurses and doctors. Studies emphasized experiential learning to develop and reinforce skills; online learning for knowledge dissemination; multi-sectoral partnerships, institutional support and carefully constructed planning task forces, rapid training development and dissemination, and use of training models. Conclusion: It Most studies evaluated only knowledge or self-confidence of trainees. Relatively few assessed skills; evaluations of long-term outcomes were rare. Little evidence is available about comparative effectiveness of different approaches, or optimum frequency and length of training programming. Based on principles induced, six recommendations for future JIT training are presented.