Along with the exploding attention to globalization, issues of global justice have become central elements in political philosophy. After decades in which debates were dominated by a state-centric paradigm, current debates in political philosophy also address issues of global inequality, global poverty, and the moral foundations of international law. As recent events have demonstrated, these issues also play an important role in the practice of international law. In fields such as peace and security, economic integration, environmental law, and human rights, international lawyers are constantly confronted with questions of global justice and international legitimacy. This special issue contains four papers which address an important element of this emerging debate on cosmopolitan global justice, with much relevance for international law: the principle of sovereign equality, global economic inequality, and environmental law.