There are numerous organizations, bodies, and initiatives working with the United Nations (UN) on the Sustainable Development Goals (SDGs). Here is a list of key abbreviations for those organizations and groups:

UN Bodies and Related Organizations:

1. UNDP – United Nations Development Programme
2. UNGA – United Nations General Assembly
3. UNECOSOC – United Nations Economic and Social Council
4. UNICEF – United Nations International Children's Emergency Fund
5. UNEP – United Nations Environment Programme
6. UNHCR – United Nations High Commissioner for Refugees
7. UNFPA – United Nations Population Fund
8. UNIDO – United Nations Industrial Development Organization
9. UNCTAD – United Nations Conference on Trade and Development
10. UN-Women – United Nations Entity for Gender Equality and the Empowerment of Women
11. UNRWA – United Nations Relief and Works Agency for Palestine Refugees in the Near East
12. UNICEF – United Nations Children's Fund
13. WHO – World Health Organization

Intergovernmental and Global Partnerships:

1. GCF – Green Climate Fund
2. GEP – Global Environment Facility
3. SIDS – Small Island Developing States
4. APEC – Asia-Pacific Economic Cooperation
5. G20 – Group of Twenty
6. OECD – Organisation for Economic Co-operation and Development
7. CBD – Convention on Biological Diversity
8. UNFCCC – United Nations Framework Convention on Climate Change
9. COP – Conference of the Parties (related to the UNFCCC and other environmental conventions)
10. FAO – Food and Agriculture Organization
11. WFP – World Food Programme
12. ILO – International Labour Organization
13. IFAD – International Fund for Agricultural Development
14. UNESCO – United Nations Educational, Scientific and Cultural Organization
15. UNDP – United Nations Development Programme
16. UNAIDS – United Nations Programme on HIV/AIDS

Business and Private Sector Initiatives:

1. UNGC – United Nations Global Compact
2. WBCSD – World Business Council for Sustainable Development
3. PRI – Principles for Responsible Investment
4. B4IG – Business for Inclusive Growth
5. G20 B20 – G20 Business 20
6. WEPs – Women’s Empowerment Principles (UN Women & UN Global Compact)

Financial and Economic Organizations:

1. WB – World Bank
2. IMF – International Monetary Fund
3. AIIB – Asian Infrastructure Investment Bank
4. ADB – Asian Development Bank
5. EIB – European Investment Bank
6. IDB – Inter-American Development Bank
7. ECOSOC – Economic and Social Council (UN)

Human Rights and Development Initiatives:

1. OHCHR – Office of the High Commissioner for Human Rights
2. NHRIs – National Human Rights Institutions
3. CIVICUS – CIVICUS World Alliance for Citizen Participation
4. PNUD – Programa de las Naciones Unidas para el Desarrollo (Spanish for UNDP)

Climate Change and Environmental Groups:

1. IPCC – Intergovernmental Panel on Climate Change
2. UNCCD – United Nations Convention to Combat Desertification
3. UNFCCC – United Nations Framework Convention on Climate Change
4. UNEA – United Nations Environment Assembly
5. UNEP FI – United Nations Environment Programme Finance Initiative
6. IUCN – International Union for Conservation of Nature

Other Global Initiatives:

1. G7 – Group of Seven
2. G77 – Group of 77 (developing countries)
3. SDG-Fund – Sustainable Development Goals Fund
4. One Planet Summit
5. Global Compact Network
6. Global Reporting Initiative (GRI)

These organizations, initiatives, and bodies collaborate with the UN and contribute to advancing the SDGs through policy advocacy, research, funding, technical support, and partnerships. Their work focuses on promoting sustainability, reducing inequality, addressing climate change, and ensuring that no one is left behind in achieving the 2030 Agenda for Sustainable Development.