| Acronym | Definition |
|---|
| IRAS | Inland Revenue Authority of Singapore |
| IRAS | Infrared Astronomy Satellite |
| IRAS | Infrared Astronomical Satellite |
| IRAS | Integrated Research Application System (online collaborative initiative; UK) |
| IRAS | Infra Red Source |
| IRAS | Infra Red Astronomical Satellite |
| IRAS | Internet Routing and Access Service |
| IRAS | Infrared Reflection Absorption Spectroscopy |
| IRAS | Insulin Resistance and Atherosclerosis Study |
| IRAS | Indian Railway Accounts Service (India) |
| IRAS | IPsec Remote Access Server (IP security protocols, IKE mode config) |
| IRAS | Institute on Religion in an Age of Science, Inc. |