| IAIS | I Am I Said 
| Others |
| IAIS | Improved Avionics Intermediate Shop
| Others |
| IAIS | Indigenous and American Indian Studies
| Others |
| IAIS | Industry Agreed Implementation Standards
| Others |
| IAIS | Institute for American Indian Studies
| Others |
| IAIS | Institute of Arab and Islamic Studies
| Others |
| IAIS | Instructional Analysis Information System
| Others |
| IAIS | Integrated Academic Information System
| Others |
| IAIS | Intelligent Analysis and Information Systems
| Others |
| IAIS | Internal Affairs Investigative Services
| Others |
| IAIS | International Activity Information System
| Others |
| IAIS | International Association of Inflammation Societies
| Others |
| IAIS | International Association of Insurance Supervisors
| Others |
| IAIS | International Associations of Insurance Supervisors
| Others |
| IAIS | Inventory Always In Stock
| Others |
| IAIS | Iowa Interstate Railroad
| Others |
| IAIS | Iowa Interstate Railroad Limited
| Others |
| IAIS | Israeli Association for International Studies
| Others |