In June 2017 a Memorandum of Understanding was signed between the IOI and the Caribbean Ombudsman Association (CAROA).
Established in 1998, CAROA is a member-based organization of Ombudsman offices in the Caribbean region. As of 2013, there are 15 Ombudsman offices established in the Caribbean region, of which 11 are functioning with Ombudsman in office.
On 16 May 2017 a Memorandum of Understanding was signed between the IOI and the Forum of Canadian Ombudsman (FCO).
The FCO was formed in 2000 by a group of ombudsman practitioners with a desire to provide a “home” for like minded individuals. FCO currently boasts more than 450 private and corporate members from all areas of Canada from the Atlantic to the Pacific to the Arctic coasts.
On 20 October 2016 a Memorandum of Understanding was signed between the IOI and the Association of Ombudsman and Mediators of the Francophonie (AOMF).
Founded in 1998, the Association of Ombudsmen and Mediators of the Francophonie (AOMF) has 54 members across the continents in countries sharing French as a common language. The objectives pursued include promoting the Francophonie's knowledge of the role of the Ombudsman and the Ombudsman in serving citizens in order to strengthen their confidence in public services.
On 13 May 2016 a Memorandum of Understanding was signed between the IOI and the British and Irish Ombudsman Association (OA).
The OA is a professional association for ombudsmen and complaint handlers, their staff and others interested in the work of independent complaint resolutions.
On 27 April 2016 a Memorandum of Understanding was signed between the IOI and the Federaion of Ibero-American Ombudsman (FIO).
Created 20 years ago, FIO today brings together more than 75 Ombudsman institutions, from 20 Ibero-American countries and provides them with a forum for cooperation and the promotion, dissemination and strengthening of the Ombudsman concept.
On 23 September 2015 a Memorandum of Understanding was signed between the IOI and the Australian and New Zealand Ombudsman Associaton (ANZOA).
The ANZOA is the peak body for Ombudsmen in Australia and New Zealand.
The 28th Annual Meeting of the International Coordinating Committee (ICC) of National Institutions for the Promotion and Protection of Human Rights in Geneva was marked by the official signing of a Memorandum of Understanding between the ICC and the IOI on 12 March 2015.
By signing this Memorandum of Understanding the leaders of both organizations emphasised the high value of this cooperation agreement and expressed their deep hope that members from both organisations will mutually benefit of this joint cooperation.
On 27 October 2014 a Memorandum of Understanding was signed between the IOI and the Institute of Latin-American Ombudsman (ILO).
Created in 1984, ILO aims at encouraging the concept of ombudsmanship, contributing to the reinforcement of democratic processes and promoting and protecting human rights. Additionally to enhancing the concept of Ombudsmanship, ILO fosters related studies and seeks the creation of networks and cooperation amongst various Ombudsman institutions.
On 16 April 2013 a Memorandum of Understanding was signed between the IOI and the African Ombudsman and Mediators Association (AOMA).
AOMA encourages the establishment, development and promotion of African Ombudsman institutions and furthers mutual support, cooperation and joint activities through information sharing, training and development of Ombudsman and their staff.
On 13 November 2012 a Memorandum of Understanding was signed between the IOI and the International Anti-Corruption Academy (IACA).
IACA is an international organization located in Austria and founded in a joint initiative by the United Nations Office on Drugs and Crime (UNODC), the Republic of Austria, the European Anti-Fraud Office (OLAF) and other stakeholders. The organization functions as an independent centre of excellence in the field of anti-corruption education, training and academic research and offers training programs and a Master in Anti-Corruption Studies (MACS).