A National human rights institution (NHRI) is an independent institution bestowed with the responsibility to broadly protect, monitor and promote human rights in a given country. The growth of such bodies has been encouraged by the Office of the United Nations High Commissioner for Human Rights (OHCHR) which has provided advisory and support services, and facilitated access for NHRIs to the UN treaty bodies and other committees. There are over 100 such institutions, about two-thirds assessed by peer review as compliant with the United Nations standards set out in the Paris Principles. Compliance with the Principles is the basis for accreditation at the UN, which, uniquely for NHRIs, is not conducted directly by a UN body but by a sub-committee of the International Coordinating Committee of National Human Rights Institutions (ICC). The secretariat to the review process (for initial accreditation, and reaccreditation every five years) is provided by the National Institutions and Regional Mechanisms Section of the OHCHR.
NHRIs can be grouped together in two broad categories: human rights commissions and ombudsmen. While most ombudsman agencies have their powers vested in a single person, human rights commissions are multi-member committees, often representative of various social groups and political tendencies. They are sometimes set up to deal with specific issues such as discrimination, although some are bodies with very broad responsibilities. Specialised national institutions exist in many countries to protect the rights of a particular vulnerable group such as ethnic and linguistic minorities, indigenous peoples, children, refugees persons with disabilities or women.