There are a multitude of UN legal instruments which pertain to the rights of freedom of expression and information, and this book is the first to comprehensively map them and their function. It details the chequered history of both of these rights within the UN system and evaluates the suitability of the system for overcoming contemporary challenges and threats to the rights. Leading scholars address key issues, such as how the rights to freedom of expression and information can come into conflict with other human rights and with public policy goals, such as counter-terrorism. The book's institutional focus comprises five international treaties, UNESCO and the UN Special Rapporteur on freedom of expression. Relevant for academics, lawyers, policy-makers and civil society actors, it also examines how new communication technologies have prompted fresh thinking about the substance and scope of the rights to freedom of expression and information.