With 166 members, the Global Forum on Transparency and Exchange of Information for Tax Purposes is the leading international body working on the implementation of global transparency standards around the world. 

The Global Forum has 21 observers: 

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