| IAAC | Impact Assessment Agency of Canada 
| Others |
| IAAC | Independent Audit Advisory Committee
| Others |
| IAAC | Indiana Asian American Conference
| Others |
| IAAC | Indo American Arts Council
| Others |
| IAAC | Indo-American Arts Council
| Others |
| IAAC | Industry Affairs Advisory Council
| Others |
| IAAC | Information Assurance Advisory Council
| Others |
| IAAC | Institute for Advanced Architecture of Catalonia
| Others |
| IAAC | Institute of Advanced Architecture of Catalonia
| Others |
| IAAC | Inter American Accreditation Cooperation
| Others |
| IAAC | Inter-Agency Advisory Committee
| Others |
| IAAC | Inter-collegiate Athletics Advisory Committee
| Others |
| IAAC | InterAmerican Accreditation Cooperation
| Others |
| IAAC | Intercollegiate Athletic Advisory Committee
| Others |
| IAAC | Internal Amplification and Animal Control
| Others |
| IAAC | International Alliance for the Advancement of Children
| Others |
| IAAC | International Antarctic Analysis Center
| Others |
| IAAC | International Antarctic Analysis Centre
| Others |
| IAAC | International Astronomy and Astrophysics Competition
| Others |
| IAAC | International Awards for Art Criticism
| Others |
| IAAC | Internet Amateur Astronomers Catalog
| Others |
| IAAC | Irish Aid Advisory Committee
| Others |
| IAAC | Irish American Athletic Club
| Others |
| IAAC | Israel Action Advocacy Committee
| Others |