| Olentangy Local School District, OH (District) |
| Oley Valley SD, PA (District) |
| Olfen ISD, TX (District) |
| Olin Consolidated School District, IA (District) |
| Olive, OK (District) |
| Oliver County, ND (ISD) |
| Oliver-Mercer Special Ed Unit, ND (District) |
| Olivet Community Schools, MI (District) |
| Olmsted County, MN (ISD) |
| Olmsted Falls City School District, OH (District) |
| Olney Charter High School, PA (District) |
| Olney ISD, TX (District) |
| Olney-Bissell Elem, MT (District) |
| Olton ISD, TX (District) |
| Olustee, OK (District) |
