Over the past five years, behavioural economics has been rapidly propelled from the margins of economic analysis towards the policy mainstream. In this context, this study offers an international review of the initial applications of behavioural economics to policy, with a particular focus on regulatory policy. It describes the extent to which behavioural findings have begun to influence public policy in a number of OECD countries, referring to a total of more than 60 instances, the majority of which concern regulatory policy.