| IRAS | Infrared Ray Astronomical Satellite | 红外线天文卫星 |
| IRAS | Institute on Religion in an Age of Science, Inc. | 科学时代宗教研究所。 |
| IRAS | Infrared Reflection Absorption Spectroscopy | 红外反射吸收光谱 |
| IRAS | IPsec Remote Access Server (IP security protocols, IKE mode config) | IPsec远程访问服务器（IP安全协议，IKE模式配置） |
| IRAS | Infrared Astronomy Satellite | 红外天文卫星 |
| IRAS | Infrared Reflection-Absorption Spectroscopy | 红外反射吸收光谱 |
| IRAS | Insulin Resistance and Atherosclerosis Study | 胰岛素抵抗与动脉粥样硬化研究 |
| IRAS | Inland Revenue Authority of Singapore | 新加坡税务局 |
| IRAS | Infrared Astronomical Satellite | 红外天文卫星 |