| Acronym | Definition |
|---|
| IAAS | Infrastructure as a Service |
| IAAS | Integration as a Service (form of Software as a Service) |
| IAAS | Information As A Service |
| IAAS | International Association of Agricultural Students |
| IAAS | Institute of Agriculture and Animal Science (Nepal) |
| IAAS | International Association for Ambulatory Surgery (est. 1995) |
| IAAS | International Association of Students in Agriculture and Related Sciences |
| IAAS | International Association for Astronomical Studies (Denver, Colorado) |
| IAAS | Insurance and Actuarial Advisory Services |
| IAAS | Indian Audit and Accounts Service (India) |
| IAAS | Institute of Auctioneers and Appraisers in Scotland |
| IAAS | Incorporated Association of Architects and Surveyors (now Association of Building Engineers) |
| IAAS | Indian Association for the Advancement of Science (New Delhi, India) |