| IRST | Institute for Scientific and Technological Research | 科学技术研究所 |
| IRST | Istituto per la Ricerca Scientifica e Tecnologica (Centre for Scientific and Technological Research, Istituto Trentino d | 科学与技术研究中心 |
| IRST | infrared search and track (US DoD) | 红外搜索和跟踪（美国国防部） |
| IRST | Incident Response and Security Team | 事件响应和安全团队 |
| IRST | Infrared Search and Track (Capability) | 红外搜索和跟踪（能力） |