| Abbreviation | Definition |
|---|---|
| IAPC | Institute for the Advancement of Philosophy for Children |
| IAPG | Institute for Astronomical and Physical Geodesy |
| IAPH | Institute of Aboriginal Peoples Health |
| IAPS | Institute for Advanced Physical Studies |
| IAPS | Institute Of Asia Pacific Studies |
| IAR | Institute for Aerospace Research |
| IAR | Institute for Agricultural Research |
| IAR | Institute for Autism Research |
| IAR | Institute of Audio Research |
| IARA | Institute for Anthropological Research in Africa |
| IARCC | Institute for Agricultural Research on Climate Change |
| IARI | Indian Agriculture Research Institute |
| IARM | Institute for Agile Risk Management |
| IARS | Institute for African Renaissance Studies |
| IAS | Institute for Advanced Studies |
| IAS | Institute of Alcohol Studies |
| IASCP | Institute for Advanced Study of the Communication Processes |
| IASE | Institute for Advanced Systems Engineering |
| IASE | Institute of Advanced Studies in Education |
| IASI | Irish Accommodation Services Institute |