| 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 |