The Interparliamentary Assembly on Orthodoxy (Greek: Διακοινοβουλευτική Συνέλευση Ορθοδοξίας, Russian: Межпарламентская Ассамблея Православия), or I.A.O., is a transnational, inter-parliamentary institution that in 1994 was originally established as the European Interparliamentary Assembly on Orthodoxy (EIAO).

[2] On 19 May 2010, a cooperation agreement with the Pan-African Parliament was signed by PUIC's President Idriss Ndele Moussa and I.A.O.

's Secretary-General Anastasios Nerantzis[4] Massive protests broke out during the 2019 General Assembly in Tbilisi, Georgia, after the chairman of the assembly, a Russian communist named Sergei Gavrilov, made a number of public statements that were viewed by the Georgian public as denigrating Georgian sovereignty.

It is headed by the Secretary-General, the Alternate Secretary and the Treasurer, and consists of an additional six members from various countries.

[8] As of 2020, the leadership consists of: International Secretariat representatives: As of 2020, the following committees are led by: The Assembly currently consists of parliamentary committees of 21 countries, mostly from Eastern Europe, including:[8] Additionally, delegations from Africa, Asia, Australia, the European Union, and the United States have been participating in the Assembly.