| 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) |
| Ouachita Parish, LA (District) |
| Ouachita River School District, AR (District) |
| Ouachita School District, AR (District) |
| Ouachita Vocational Center, AR (District) |
| Our World Neighborhood 3, NY (PSA) |
| Our World Neighborhood Charter School, NY (PSA) |
| OUR WORLD NEIGHBORHOOD CS 2, NY (PSA) |
