International Organization of Supreme Audit Institutions

Tonga Office of the Auditor General, TOAG, is a member of the International Organization of Supreme Audit Institutions (INTOSAI). INTOSAI issues the International Standards of Supreme Audit Institutions (ISSAI), which have been adopted by the TOAG..

Pacific Association of Supreme Audit Institutions

The TOAG is also an active member of the Pacific Association of Supreme Audit Institutions (PASAI) - the regional arm of INTOSAI in the Pacific.

The TOAG is also a member of the British Commonwealth Auditor General's Conference. 

Australia and New Zealand Institute of Chartered Accountants

The TOAG is the only approved Training Organisation for New Zealand Institute of Chartered Accountants in Tonga to train and as mentor for those who strive to obtain the chartered accountants professional qualification.