| IAAP | Illinois Association of Aggregate Producers 
| Others |
| IAAP | Implementation Assistance and Approval Programme
| Others |
| IAAP | Indian Academy of Applied Psychology
| Others |
| IAAP | Indiana Association for Addiction Professionals
| Others |
| IAAP | Information Assurance Awareness Program
| Others |
| IAAP | Intensive Agricultural Area Program
| Others |
| IAAP | Interactive Asthma Action Plan
| Others |
| IAAP | Intercontinental Association of Administrative Professionals
| Others |
| IAAP | International Assistance and Adoption Project
| Others |
| IAAP | International Association for Analytical Psychology
| Others |
| IAAP | International Association of Accessibility Professionals
| Others |
| IAAP | International Association of Accounting Professionals
| Others |
| IAAP | International Association of Adjunct Practitioners
| Others |
| IAAP | International Association of Administrative Personnel
| Others |
| IAAP | International Association of Administrative Professionals
| Others |
| IAAP | International Association of Angel Practitioners
| Others |
| IAAP | International Association of Anthroposophic Pharmacists
| Others |
| IAAP | International Association of Architectural Photographers
| Others |
| IAAP | Iowa Army Ammunition Plant
| Others |
| IAAP | Iowa Association of Activity Professionals
| Others |
| IAAP | Iranian American Academics and Professionals
| Others |
| IAAP | itiative Assessment Approval Process
| Others |