| IUA | ISDN Q.921-User Adaptation Layer | ISDN Q.921用户适配层 |
| IUA | International Underwriting Association | 国际保险协会 |
| IUA | International Underwriting Association of London (formerly London International Insurance and Reinsurance Market Associa | 伦敦国际保险协会（前伦敦国际保险和再保险市场协会 |
| IUA | International Union of Architects | 国际建筑师联合会 |
| IUA | International Union of Academies | 国际学术联合会 |
| IUA | Image Understanding Architecture | 图像理解架构 |
| IUA | International University of Africa (Sudan) | 非洲国际大学（苏丹） |
| IUA | ISSE User Agent | ISSE用户代理 |
| IUA | Institut Universitari de l'Audivisual | Universitari Institut de fixation 'Audivisual |
| IUA | Instituto Universitario AeronÁutico (Argentina Air Force University) | Instituto Universitario AeronÁutico (Argentina Air Force University) |
| IUA | ISDN Q-921-User Adaptation Layer | ISDN Q-921用户适配层 |
| IUA | intrauterine adhesion | 子宫内粘连 |
| IUA | Izquierda Unida de AragÓn IU- | Izquierda Unida de AragÓn IU |
| IUA | Individual User Authentication (Cisco) | 个人用户身份验证（Cisco） |
| IUA | international union of angiology | 国际血管学联合会 |
| IUA | intravascular ultrasound angioplasty | 血管内超声血管成形术 |
| IUA | international union against alcoholism | 国际反酗酒联盟 |