| IAAS | Icesinternal Audit Advisory Services 
| Others |
| IAAS | Incident Alerting And Assessment System
| Others |
| IAAS | Incorporated Association of Architects and Surveyors
| Others |
| IAAS | Independent Academies Assured Services
| Others |
| IAAS | Indian Audit and Accounts Service
| Others |
| IAAS | Indian Audits and Accounts Service
| Others |
| IAAS | Information As A Service
| Others |
| IAAS | Infrastracture as a Service
| Others |
| IaaS | Infrastructure as a Service
| Technology |
| IAAS | Inner Asian and Altaic Studies
| Others |
| IAAS | Institute For African American Studies
| Others |
| IAAS | Institute of Advanced Advertising Studies
| Others |
| IAAS | Institute Of Aerospace And Automotive Studies
| Others |
| IAAS | Institute Of African And Asian Studies
| Others |
| IAAS | Institute Of Agriculture And Animal Science
| Others |
| IAAS | Institute Of Agriculture And Animal Sciences
| Others |
| IAAS | Institute Of Aquatic And Atmospheric Sciences
| Others |
| IAAS | Insurance and Actuarial Advisory Services
| Others |
| IAAS | Integrated Agri Aquaculture Systems
| Others |
| IAAS | Integration as a Service
| Others |
| IAAS | Integrative Approaches To Abiotic Stress
| Others |
| IAAS | Internal Audit And Advisory Services
| Others |
| IAAS | International Association for Ambulatory Surgery
| Others |
| IAAS | International Association for Astronomical Studies
| Others |
| IAAS | International Association of Agricultural Students
| Others |
| IAAS | Irish Association for Asian Studies
| Others |