There is an inherent tension in international human rights law between affirming a universal substantive vision of human dignity and respecting the diversity and freedom of human cultures. Although understanding and securing human rights in international law requires us to grapple with that conflict, classic notions of state sovereignty cannot adequately address the issue. The principle of subsidiarity, instead, gives us a conceptual tool to mediate the polarity of pluralism and the common good in a globalized world and helps us make sense of international human rights law. I argue that we should regard subsidiarity as a structural principle of international human rights law.