Globalisation has helped to intensify the international flow of people, information and policies. Following this process there has been increasing global concern regarding problems in areas such as immigration, health, poverty, among others. Various agents are transnationally engaged in common responses to these issues. The classic definition of public policies is related to actions undertaken by governments to solve the problems within their jurisdictions. However, often problems do not respect national boundaries. Sometimes, policies need to involve other nations. This article discusses the main issues, concepts and challenges in the study of global public policies.First, the article presents a review of the existing literature. Second, it introduces the key agents and agendas of global public policy. The discussion section focuses on the latest challenges and opportunities for research in Global Public Policy studies. Finally, new avenues of research are introduced, such as the dimension of power, the impact of the far-right and the outbreak of the COVID-19 pandemic.