Since early 2018, there has been a series of letters and documents related to the UN2020 Initiative open for civil society endorsement. The following organizations have expressed support for one or more of these letters and documents.

Academic Council on the United Nations System
Action for Sustainable Development (A4SD)
Action on SDGs Kenya National Coalition (ASDGC-KENYA)
Adéquations, France
Afghanistan Justice Organization
African Coalition on Green Growth
African Foundation for Environment and Development
African Philanthropic Foundation
Afrihealth Optonet Association, Nigeria
All for Education! National Civil Society Coalition
All Win Network Foundation
Amis des Etrangers au Togo
Asabe Shehu Yar’Adua Foundation
Asia Development Alliance (ADA)
Association 3 Hérissons
Association for Farmers Rights Defense (AFRD)
Association for Promotion Sustainable Development, India
Association Luxembourgeoise pour les Nations Unies (ALNU/ UNA Luxembourg)
Association of World Citizens
Association pour Action de Développement Communautaire (AADC), Burundi
Association pour l’Integration et le Developpement Durable (AIDB), Burundi
Assoiation of World Citizens
Bangladesh Model Youth Parliament
Blue Banner NGO (Mongolia)
Bread for the World, Germany
Buddhist Tzu Chi Foundation
Campaign for a UN Parliamentary Assembly
Canadian Voice of Women for Peace
Centre for Human Rights – Nis
Centre for Human Rights and Climate Change Research
Centre for Human Rights and Development 
Centre for Socio-Eco-Nomic Development (CSEND)
Child Rights International Network
Citizens for Global Solutions
CIVICUS: World Alliance for Citizen Participation
Civil Society Development Association (ARGO)
Climate Change Network Nigeria (CCN-NIGERIA)
Climate Watch Thailand
Commons Cluster of the UN NGO Major Group
Community Science Centre Vadodara (India)
Congregation of Our Lady of Charity of the Good Shepherd
Control Arms
Council of Organizations of the UNA-USA
Council on Energy, Environment and Water (CEEW), India
Deepti Bhuban
Democracy Matters
Democracy Without Borders
Democracy Without Borders Sweden
Development Goals Global Watch (DGGW) Inc.
Die Mondialisten
Dr Uzo Adirieje Foundation (DUZAFOUND)
East Africa Climate Change Network
Echoes of Women in Africa Initiative (ECOWA), Nigeria
Elizka Relief Foundation
Elmoustkbal for Media, Policy and Strategic Studies, Egypt
Emmaus International
Emonyo Yefwe International
End Water Poverty
Enlaces por la Sustentabilidad, El Salvador
EPE (Ethical-Possibility-Enhancement) Movement
Equality Bahamas
Equidad de Género
Equity and Justice Society for One Plateau
Federación de Planificación Familiar Estatal
Federation of Environmental and Ecological Diversity for Agricultural Revampment and Human Rights
Feminist League
Fiji Women’s Rights Movement
Fondazione Proclade Internazionale – Onlus
Foundation for Women’s Rights Promotion and Development
Free Trade Union Development Center (FTUDC), Sri Lanka
Friedrich-Ebert-Stiftung New York Office
Fundación Arcoiris por la Diversidad Sexual, Mexico
Fundación para Estudio e Investigación de la Mujer (FEIM)
Gatef organization
Global Call to Action against Poverty
Global Citizen
Global Family
Global Justice Now
Global Voice
Globalt Fokus
Graduate Women International
Green Hope Foundation
Guahan Coalition for Peace and Justice
Habitat International Coalition
HaritaDhara Research Development and Education Foundation, India
Hawai’i Institute for Human Rights
HOPE Worldwide-Pakistan
Housing and Land Rights Network
Idara-e-Taleem-o-Aagahi Public Trust (ITA) / Centre for Education and Consciousness
Igarapé Institute
Indian Ocean Peace Council (IOPC)
INDICEP – Instituto de Investigación Cultural para Educación Popular
INHURED International
Institute for Planetary Synthesis
Institute For Sustainable Development and Research, ISDR, India
Institute of the Blessed Virgin Mary – Loreto Generalate
International Alliance of Women (IAW)
International Association for Religious Freedom – IARF South Asia
International Association for the Advancement of Innovative Approaches to Global Challenges IAAI
International Association of World Peace Advocates
International Environment Forum
International Federation of Business and Professional Women (IFBPW)
International Federation of Settlements and Neighborhood Centers
International Federation of Women in Legal Careers (FIFCJ)
International Federation of Women Lawyers (FIDA)
International Federation on Ageing (IFA)
International Media Support (IMS)
International Network for Corporate Social Responsibility
International Network for the Prevention of Elder Abuse (INPEA)
International Peace Bureau
International Presentation Association
International School of Santo Domingo
JAD (Justice, Action, and Development) Foundation
Jeunes Volontaires pour l’Environnement (Sena Alouka)
Joint Energy and Environment Projects
Journalists for Human Rights, Macedonia
Justice Coalition of Religious
Justice for All/BurmaTask Force
Justice, Aid and Development Foundation
Kenana Association for Sustainable Development and Women Empowerment, Egypt
Kikandwa Environmental Association (KEA), Uganda
Krisoker Sor (Farmers’ Voice), Bangladesh
KULU – Women and Development, Denmark
Kyosiga Community Christian Association for Development (KACCAD), Uganda
Labour, Health and Human Rights Development Centre
Lanka Fundamental Rights Organization, Sri Lanka
Lawyers Committee on Nuclear Policy
Learning for Sustainability, Scotland
Leiden University
Let There Be Light International
Literate Pakistan Programme (Syed Ejaz Hussain Shah)
Mahila Dakshata Samiti, India
Mexican Foundation for Family Planning
Millennia2025 Women and Innovation Foundation
Mills College
National Campaing For Sustainable Development Nepal
National Coalition of Civil Society Organizations of Liberia (NSACCSOL)
National Society of Conservationists – Friends of the Earth, Hungary
NET Africa – Natural Environment Technology (Fadeke Ayoola)
Network of Rural Women Producers Trinidad and Tobago (NRWPTT)
NGO Committee on Sustainable Development – NY
NGO Federation of Nepal
NGO Legal Media Center
NGO-Coordination post Beijing Switzerland
Nigeria Network of NGOs
Noble Delta Women for Peace and Development
Nonviolence International
Noordendorp International Company
NQBSS Livestock Breeders
NQBSS Livestock Breeders
Omaki and Moses-Ugo-Ohaegbuchi)
One heart ONE LOVE 
One World Trust
Parliamentarians for Nuclear Non-Proliferation and Disarmament
Partenariat National de l’Eau de Guinée (PNEGUI)
Peace Center Lahore
People’s forum and Platform of SDGs  -Network
PEPL Institute – Peace Education and Political Leadership Institute
Plastic Pollution Coalition (PPC)
PyeongChang Global Peace Forum
Radanar Ayar Association, Myanmar
Radha Paudel Foundation, Nepal
Rapad Maroc, Morocco
Reacción Climática- Bolivia
Recherches et Documentation Juridiques Africaines (RDJA) asbl
Red Dot Foundation Global
Red Dot Foundation, India
Reseau des citoyens haitiens pour la promotion des droits de l’homme
RIPESS Intercontinental Network for the Promotion of Social Solidarity Economy
Rural Area Development Programme (RADP), Nepal
Rural Builders Organisation (Andrew Oshogwe)
Russian Association of Progressive Humanists – Российское Объединение
Salesian Missions Inc.
Sanctus Initiative for Human Development and Values Sustainability (SIHDEVAS)
Savannah Centre for Diplomacy, Democracy and Development
Scofield Associates
Scottish Ahlul Bayt Society
Scottish Council for Voluntary Organisations
SenEval Association Sénégalaise d’évaluation
Servicios Ecuménicos para Reconciliación y Reconstrucción
Shirley Ann Sullivan Educational Foundation
Shishu Aangina
Shumei International
Sisters of Charity Federation
Society for Conservation and Sustainability of Energy and Environment in Nigeria (SOCSEEN) 
Society for International Development (SID)
Society for Threatened Peoples – Germany
Society of Catholic Medical Missionaries
Solar Health Uganda
Soroptimist International
Soroptimist International Great Britain & Ireland (SIGBI)
Southern Africa Climate Change Coalition
Southern Africa Human Rights NGO Network (SAHRiNGON) Tanzania Chapter
SRS Livestock Development Foundation
Stakeholder Forum for a Sustainable Future
Stanley Foundation
Success Capital Organisation
Tamkeen Association for Rights of People with Disabilities, Egypt
Terram Pacis
The Global Sunrise Project 
The Millenials Movement
The Mondialists – World Citizens for the Unity of Mankind
The Stimson Center (Just Security 2020 Program)
Theatre of Transformation Academy
Theorist and Member Academic Council of the United Nations System
Together First
Transdiaspora Network
U-Solve School of Empathic Leadership & Entrepreneurship (SELE)
UDYAMA (Pradeep Mahapatra)
Union des Amis Socio Culturels d’Action en Development (UNASCAD), Haiti
United Methodist Church—General Board of Church and Society
United Nations Association – Australia (Lachlan Hunter)
United Nations Association – Denmark (Torleif Jonasson)
United Nations Association – Finland
United Nations Association – Germany
United Nations Association – Scotland
United Nations Association – Suriname
United Nations Association – UK
United Nations Association – USA Council of Organizations
United Nations Association – Zimbabwe
VOICE, Bangladesh
Women Coalition for Agenda 2030
Women Environmental Programme (WEP)
Women for Water Partnership
Women’s Federation for World Peace International
Women’s Major Group for Sustainable Development
Women’s March Global
Women’s International League for Peace and Freedom (WILPF)
Workable World Trust
World Citizens Association of Australia
World Council of Peoples for the United Nations (WCPUN)
World Democratic Governance project asociation – WDGpa
World Federalist Movement – Canada
World Federalist Movement – Institute for Global Policy (WFM-IGP)
World Federation for Mental Health
World YWCA
Youth Foundation of Bangladesh
YWCA Canada
Zimbabwe Climate Change Coalition
Zimbabwe United Nations Association 
Zimbabweanwomen5050 Trust
Zonta International