| IRSA | International Radiosurgery Support Association | 国际放射外科支持协会 |
| IRSA | Invercargill Returned Services' Association, Inc. (Southland, New Zealand, affiliated with Royal New Zealand Returned S | Invercargill回到服务协会有限公司创立于1996年。(南方,新西兰,隶属于纽西兰皇家回到服务协会有限公司) |
| IRSA | International Rett Syndrome Association | 国际Rett综合征协会 |
| IRSA | Independent Railway Supervisors Association | 独立铁路监理协会 |
| IRSA | International Rural Sociology Association | 国际农村社会学协会 |
| IRSA | International RadioSurgery Association | 国际放射外科协会 |
| IRSA | Institute of Remote Sensing Application (China) | 遥感应用研究所(中国) |
| IRSA | Istituto di Ricerca Sulle Acque (Italian: Water Research Institute) | Istituto di Ricerca Sulle Acque(意大利语:水研究所) |
| IRSA | Indus River System Authority | 印度河流域管理局 |
| IRSA | Infrared Science Archives | 红外科学档案 |
| IRSA | Istituto Per Le Ricerche Di Storia Dell'arte (Italian: International Institute for Art Historical Research) | Ricerche迪Storia Istituto /少戴尔'arte(意大利:国际艺术历史研究) |
| IRSA | Lackfabrik Irmgard Sallinger GmbH (Deisenhausen, Germany) | Lackfabrik Irmgard Sallinger GmbH(德国德森豪森) |
| IRSA | Institut Royal des Sourds et Aveugles (Brussels school for deaf & blind) | Sourds Aveugles等Institut皇家药物洗脱支架(比利时布鲁塞尔学校和盲聋人) |
| IRSA | iodinated rat serum albumin | 碘化大鼠血清白蛋白 |
| IRSA | idiopathic refractory sideroblastic anemia | 特发性难治性铁母细胞贫血 |
| IRSA | Immigration and Refugee Services of America | 美国移民和难民服务 |
| IRSA | Inversiones y Rentas, S.A. | Inversiones y Rentas,S.A.公司。 |