| Osborne County, KS (District) |
| Osborne County, KS (ISD) |
| Osceola, MO (District) |
| Osceola, FL (District) |
| Osceola Comm,Arts & Bus Ch Sch, AR () |
| Osceola County, IA (ISD) |
| Osceola County, FL (ISD) |
| Osceola Public Schools, NE (District) |
| Osceola School District, AR (District) |
| Osceola School District, WI (District) |
| Oscoda Area Schools, MI (District) |
| Oshki Ogimaag Charter School, MN (District) |
| Oshkosh Area School District, WI (District) |
| Oskaloosa Comm School District, IA (District) |
| Oskaloosa Public Schools, KS (District) |
