RIOS
| Acronym | Definition |
|---|---|
| RIOS | Remote Input Output System |
| RIOS | Recycling Industry Operating Standard |
| RIOS | Reactive Infinite-Order Sudden |
| RIOS | Research Internships in Ocean Sciences (Rutgers University; New Brunswick, NJ) |
| RIOS | Rhode Island Orchid Society |
| RIOS | Respiratory Illness Opinion Survey (psychology) |