| Abbreviation | Definition |
|---|---|
| IAMSAR | International Aeronautical and Maritime Search and Rescue Manual |
| IAMUS | Installation Automated Manpower Utilization System |
| IAO | Information Awareness Office |
| IAP | Imagery Architecture Plan ( Air Force) |
| IAP | Info Architecture Plan |
| IAP | International Airport |
| IAPR | International Air Power Review |
| IAR | Installation Allowances Report |
| IAR | Interoperability Assessment Report |
| IARC | International Aerial Robotics Competition |
| IARO | Indian Army Reserve of Officers |
| IARO | Indian Army Reserve Officers |
| IAS | Increased Attack Speed |
| IAS | Intelligence Analysis System |
| IAS | International Armaments Strategy |
| IASC | Interagency Standing Committee (UN) |
| IASC | Interim Acting Service Chief |
| IASED | Information Assurance and Security Engineering Directorate |
| IASH | Improved Army Space Heater |
| IASIW | Institute for the Advanced Study of Information Warfare |