This report presents the findings from a quasi-systematic review, or Rapid Evidence Assessment (REA), of the international literature in relation to public confidence in the criminal justice system, with a view to assisting with policy formation in the Department of Justice and Equality. The research sought to address a range of questions relating to: how public confidence in criminal justice systems is measured across nation states; what are the main drivers of public confidence in this regard; and, what interventions have been deployed to improve public confidence in criminal justice. In order to provide a comprehensive picture of the available evidence in this area, a range of online databases and government websites were searched using a comprehensive list of research terms.