The chapter focuses on how the behavioural insights discussed in previous chapters affect policy, and how policy can use behavioural incentives to be more effective. It offers examples of policy interventions that have been successful in settings around the world. It provides some history and context for the proliferation of behavioural economics-related efforts in policy and in heath policy specifically. It describes four of the frameworks used to describe policymaking with behaviour in mind; MINDSPACE, COM-B, EAST and BASIC. It includes examples from international contexts where behavioural health policies have been enacted.