The United Nations' Universal Declaration of Human Rights in 1948 proclaimed a vision of freedom of expression exercised regardless of frontiers. Nonetheless, laws and norms regarding the freedom or limits of expression are typically established and understood at the national level. In today's interconnected world, newfound threats to free expression have suddenly arisen. How can this fundamental right be secured at a global level? This volume brings together leading experts from a variety of fields to critically evaluate the extent to which global norms on freedom of expression and information have been established and which actors and institutions have contributed to their diffusion. The authors also consider ongoing and new challenges to these norms, from conflicts over hate speech and the rise of populism to authoritarian governments, as well as the profound disruption introduced by the internet. Together, the essays lay the groundwork for an international legal doctrine on global freedom of expression that considers issues such as access to government-held information, media diversity, and political speech. As the world risks renouncing previous commitments to the freedom of expression, Regardless of Frontiers serves as a timely reminder of just how much is at stake and what needs protecting.