RIOC
| Acronym | Definition |
|---|---|
| RIOC | Research Institute for Oriental Cultures (est. 1952; Gakushuin University; Japan) |
| RIOC | Roosevelt Island Operating Corporation (New York) |
| RIOC | Red Internacional de Organismos de Cuenca |
| RIOC | Relative Improvement Over Chance (criminology) |
| RIOC | Reserve Infantry Officer Course (USMC) |
| RIOC | Red Input/Output Controller |