RIIA
| 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) |