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The outbreak of novel viruses like COVID-19 creates many uncertainties for scientists, political leaders, and communities alike. In the absence of an effective vaccine or treatment for COVID-19, it is population-level behavioural changes, such as hand washing or self-isolation when symptomatic that are central to reducing transmission. Health authorities are faced with the challenge of how best to communicate appropriate behaviours to mitigate the risk to the public. It is crucial to understand not only the best ways of communicating this information but also how populations might respond. To conduct a rapid review to identify and synthesise evidence relating to: a) What characterises effective public health messages for managing risk and preventing disease during public health crises? and b) What influences people’s responses to public health messages about health risk communication? Key recommendations should be considered when designing and delivering public health messages: engage communities in the development of public health messaging, using credible and legitimate sources, address uncertainty immediately and with transparency, focus on unified messages from all sources, and develop messages aimed at increasing understanding, inducing social responsibility and empowering personal control. Embedding the principles of behavioural science into public health messaging is an important step towards more effective health risk communication.