Membership in IACA is open to UN Member States and intergovernmental organizations. To date, the Academy has a constituency of 72 Parties, comprising 69 UN Member States and three intergovernmental organizations. All of these Parties have either ratified or acceded to IACA’s founding treaty, the Agreement for the Establishment of IACA as an International Organization. Until 31 December 2010, the treaty was open for signature. UN Member States and intergovernmental organizations which had not signed by this date can join IACA by way of accession.

As part of its strong commitment to promoting international cooperation in the fight against corruption, the Academy has built broad partnerships with public and private sector institutions and international organizations across the globe. To this effect, it has entered into many cooperative arrangements, working with partner entities to develop anti-corruption initiatives, provide technical assistance, and exchange information.

It also enjoys close relations with its initiating partners - the United Nations Office on Drugs and Crime (UNODC), INTERPOL, the European Anti-Fraud Office (OLAF), and the Republic of Austria. The Academy also has two cooperating partners, Siemens and Motorola, who have financially contributed to its work.