IAO
IAO functions as a business shorthand for 'in and out', a title for information‑assurance officers, and the name of various professional or governmental offices.
Miscellaneous
International Affairs Office
Information Artifact Ontology
International Activities Office
International Admissions Office
Interparliamentary Assembly on Orthodoxy
I Alpha Omega
Individual Artists of Oklahoma
Community
Governmental
Academic & Science
Institute of Atmospheric Optics
International Astronomy Olympiad
International Academy of Osteopathy