The idea of multi-culturalism has had a significant impact across many areas of law. This book explores how it has shaped the recent development of international human rights law. Custodians of human rights, especially international monitoring bodies, try to advance the effectiveness of human rights standards by interpreting these standards according to a method strongly inspired by the idea of cultural relativism. By using elements of cultural identity andcultural diversity as parameters for the interpretation, adjudication, and enforcement of such standards, human rights are evolving from the traditional universal idea, to a multi-cultural one, whereby rights are interpreted in a dynamic manner, which respond to the particular needs of the communitiesand individuals directly concerned.This book shows how this is epitomized by the rise of collective rights - which is intertwined with the evolution of the rights of minorities and indigenous peoples - in contrast with the traditional vision of human rights as inherently individual. It demonstrates how the process of culturalization of human rights law can be shown through different methods: the most common being the recourse to the doctrine of the margin of appreciation left to states in defining the content of human rightsstandards, extensively used by human rights bodies, such as the European Court of Human Rights. Secondly, different meanings can be attributed to the same human rights standards by adapting them to the cultural needs of the persons and - especially - communities specifically concerned. This methodis particularly used by the Inter-American Court of Human Rights and the African Commission of Human and Peoples Rights. The book concludes that the evolution of human rights law towards multi-cultural relativism is not only maximizes the effectiveness of human rights standards, but is also necessary to improve the quality of communal life, and to promote the stability of inter-cultural relationships. However, to an extent, notions of universalism remain necessary to defend the very ideaof human dignity.