| IAO | I Alpha Omega 
| Others |
| IAO | In the Amount Of
| Others |
| IAO | Incorporated Association of Organists
| Others |
| IAO | Individual Artists of Oklahoma
| Others |
| IAO | Industry Alliance Office
| Others |
| IAO | Information Access Operations
| Others |
| IAO | Information Artifact Ontology
| Others |
| IAO | Information Assurance Officer
| Others |
| IAO | Information Awareness Office
| Others |
| IAO | Initial Asset Offering
| Others |
| IAO | Innovate Awarding Organisation
| Others |
| IAO | Input Analysis Output
| Others |
| IAO | Institut d'Asie Orientale
| Others |
| IAO | Institute for Art and Olfaction
| Others |
| IAO | Institute of Assessing Officers
| Others |
| IAO | Institute of Atmospheric Optics
| Others |
| IAO | Integrated Airport Operations
| Others |
| IAO | Interest Activities And Opinions
| Others |
| IAO | Intergovernmental Affairs Office
| Others |
| IAO | International Academy of Osteopathy
| Others |
| IAO | International Accreditation Organization
| Others |
| IAO | International Activities Office
| Others |
| IAO | International Admissions Office
| Others |
| IAO | International Affairs Office
| Others |
| IAO | International Aquarian Opera
| Others |
| IAO | International Artist Organisation
| Others |
| IAO | International Association of Orthodontics
| Others |
| IAO | International Astronomy Olympiad
| Others |
| IAO | International Automotive Operations
| Others |
| IAO | Interparliamentary Assembly on Orthodoxy
| Others |
| IAO | ion assisted oXidation
| Others |
| IAO | Italian Academy of
| Others |
| IAO | Itial Airdrop Offering
| Others |
| IAO | Itial Artist Offering
| Others |