This book explores a hitherto unexamined possibility of justifiable disobedience opened up by John Rawls’ Law of Peoples. This is the possibility of disobedience justified by appeal to standards of decency that are shared by peoples who do not otherwise share commitments to the same principles of justice, and whose societies are organized according to very different basic social institutions. Justified by appeal to shared decency standards, disobedience by diverse state and non-state actors indeed challenge injustices in the international system of states. The book considers three case studies: disobedience by the undocumented, disobedient challenges to global economic inequities, and the disobedient disclosure of government secrets. It proposes a substantial analytical redefinition of civil disobedience in a global perspective, identifying the creation of global solidarity relations as its goal.