| Ottawa Area ISD, MI (ISD) |
| Ottawa County, OK (ISD) |
| Ottawa County, KS (ISD) |
| Ottawa ESD 141, IL (District) |
| Ottawa Glandorf Local School District, OH (District) |
| Ottawa Hills Local School District, OH (District) |
| Ottawa Twp HSD 140, IL (District) |
| Otter Tail County, MN (ISD) |
| Otterville R-Vi, MO (District) |
| Otto-Eldred SD, PA (District) |
| Ottoville Local School District, OH (District) |
| Ottumwa Comm School District, IA (District) |
| Otwell Miller Academy, IN (District) |
| Ouachita County, AR (ISD) |
| Ouachita Parish, LA (ISD) |
