| Acronym | Definition |
|---|
| RIIA➣Royal Institute of International Affairs (London, UK) |
| RIIA➣Retirement Income Industry Association |
| RIIA➣Research Initiative on International Activism (social movement research; University of Technology Sydney; Australia) |
| RIIA➣Red de Intercambio de Información de las Américas |
| RIIA➣Rabbit Ileal Invasion Assay (molecular biology) |