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The International Ombudsman Institute (IOI), established in 1978, is the only global organisation for the cooperation of more than 200 independent Ombudsman institutions operating on a local, regional and national level from more than 100 countries worldwide.^[1] The Ombudsman of Western Australia,^[2] Chris Field, is the current President^[3] of the IOI since May 2021. Werner Amon, Chair of the Austrian Ombudsman Board, is the IOI's Secretary General since July 2019.

The role of Ombudsman institutions is to protect the people against the violation of rights, abuse of powers, unfair decisions and maladministration. In this sense, Ombudsman institutions are national human rights institutions. They play an increasingly important role in improving public administration while making the government's actions more open and its administration more accountable to the public.^[4]

In its effort to focus on good governance and capacity building, the IOI supports its members in a threefold way: training, research and regional subsidies for projects. The IOI is organised in six regional chapters (Africa, Asia, Australasia & Pacific, Europe, the Caribbean & Latin America and North America) and has three working languages (English, French and Spanish).

The General Secretariat is located in Vienna (Austria) and is run by the Austrian Ombudsman Board (Volksanwaltschaft) since 2009.

Many Ombudsman institutions works as national human rights institution (NHRI), while many works as mediators.^[5] In 2020, the General Assembly of United Nations "recognized that the role of Ombudsman and mediator institutions, whether they are national human rights institutions or not, is the promotion and protection of human rights and fundamental freedoms, promotion of good governance and respect for the rule of law".^[5] Also in 2020, a report to the Secretary General of UN General Assembly, encouraged "the Ombudsman, mediator and other national human rights institutions to request accreditation by the Global Alliance of National Human Rights Institutions."^[6]

• Ulf Lundvik [sv], Sweden, 1984
• Bernard Frank, United States, 1985–
• Stephen Owen, Canada, 1990
• Sir John Robertson, New Zealand, 1992–1994
• Vacancy, Argentina^[7]
• Marten Oosting [nl], Netherlands, −1999
• Sir Brian Elwood, New Zealand, 1999–2002
• Clare Lewis, 2002–2004
• Bill Angrick, United States, 2004–2010
• Mats Melin [sv], Sweden, President in 2010
• Dame Beverley Wakem, New Zealand, November 2010 – October 2014
• John Walters, Namibia, October 2014 – November 2016^[8]
• Peter Tyndall, Ireland, November 2016 – May 2021
• Chris Field, Australia, May 2021 – March 2024

• Global Alliance of National Human Rights Institutions (GANHRI) - coordinates the relationship between national human right institutions and the United Nations human rights system
• National human rights institution – Type of independent state-based institution with the responsibility to broadly protect and promote human rights in a given country

• International Ombudsman Institute