Found 6 full forms for NIOS
| Term | Full Form | Category |
|---|---|---|
| NIO(S) | Nurse Initiated Order(S) 
| Others |
| NIOS | National Institute of Open Schooling
| Others |
| NIOS | Netware Input Output System
| Others |
| NIOS | Network Identity Operating System
| Others |
| NIOS | Northern Ireland Optometric Society
| Others |
| NIOS | Not in Our School
| Others |