| Oxford School District, MS (District) |
| Oxford Township School District, NJ (District) |
| Oxford-Region 11, ME (District) |
| Oxnard, CA (District) |
| Oxnard Union High, CA (District) |
| Oyster Bay-east Norwich Central School District, NY (District) |
| Oyster River Coop School District, NH (District) |
| Oyster River Sau Office, NH (District) |
| Oysterponds Union Free School District, NY (District) |
| Ozark City, AL (District) |
| Ozark County, MO (ISD) |
| Ozark Montessori Academy Springdale, AR (PSA) |
| Ozark Mountain School District, AR (District) |
| Ozark R-Vi, MO (District) |
| Ozark School District, AR (District) |
