The Global Forum has 23 observers, listed below in alphabetical order: 

1. African Development Bank
2. African Tax Administration Forum
3. African Union Commission
4. Asian Development Bank
5. Asian Infrastructure Investment Bank
6. Caribbean Community
7. Cercle de Réflexion et d'Échange des Dirigeants des Administrations Fiscales
8. Commonwealth Secretariat
9. Council of Europe Development Bank
10. European Bank for Reconstruction and Development
11. European Investment Bank
12. Financial Action Task Force
13. Inter-American Center of Tax Administrations
14. Inter-American Development Bank
15. International Finance Corporation
16. International Monetary Fund
17. Intra-European Organisation of Tax Administrations
18. Pacific Islands Tax Administrators Association
19. Study Group on Asia-Pacific Tax Administration and Research
20. United Nations
21. West African Tax Administration Forum
22. World Bank Group
23. World Customs Organisation