| Oak Mountain Middle School | - | Junior | - | 0 | |
| Oak Mountain Middle School | - | Junior | Small | 0 | |
| Oak Ridge | - | Varsity | - | 0 | |
| Oak Ridge High School | - | Varsity | - | 0 | |
| Oak Ridge High School (CA) | - | Junior | - | 0 | |
| Oak Ridge High School (CA) | - | Junior | - | 0 | |
| Oak Ridge High School (CA) | - | Varsity | Medium | 0 | |
| Oak Ridge High School (CA) | - | Varsity | - | 0 | |
| Oak Ridge High School (CA) | - | Varsity | - | 0 | |
| Oak Ridge High School (CA) | - | Junior | Large | 0 | |
| Oakland Catholic High School | - | Varsity | - | 0 | |
| Oakland Catholic High School | - | Varsity | Small | 0 | |
| Oakland High School | - | Junior | Small | 0 | |
| Oakland High School | - | Varsity | Medium | 0 | |
| Oakland High School | - | Junior | Small | 0 | |
| Oakland High School | - | Varsity | Medium | 0 | |
| Oakland High School | - | Varsity | Small | 0 | |
| Oakland High School | - | Varsity | Small | 0 | |
| Oakleaf High School | - | Varsity | Small | 0 | |
| Oakmont | - | - | - | 0 | |
| Oakmont High School | - | Varsity | - | 0 | |
| Oakmont High School | - | Varsity | - | 0 | |
| Oakmont High School | - | - | - | 0 | |
| Oakmont High School | - | - | Large | 0 | |
| Oakmont High School | - | - | - | 0 | |
| Oakridge School | - | Junior Varsity | - | 0 | |
| Oakridge School | - | Varsity | Small | 0 | |
| Oaks Christian School | - | Varsity | Small | 0 | |
| Oaks Christian School | - | Varsity | - | 0 | |
| Oakville High School | - | Varsity | Small | 0 | |
| Oakville High School | - | Junior | - | 0 | |
| Oakville High School | - | Varsity | Small | 0 | |
| Oakwood Middle School | - | Junior | - | 0 | |
| Oasis High School | - | Varsity | - | 0 | |
| Oberlin Magnet Middle School | - | Junior | Large | 0 | |
| Oberlin Magnet Middle School | - | Junior | Small | 0 | |
| Obion County Central High School | - | Varsity | - | 0 | |
| Obion County Central High School | - | Varsity | - | 0 | |
| Ocean Springs High School | - | Varsity | Large | 0 | |
| Ocean Springs High School | - | Varsity | Medium | 0 | |
| Ocean Springs High School | - | Varsity | Large | 0 | |
| Ocean Springs Middle School | - | Junior | - | 0 | |
| Ocean Springs Middle School | - | Junior | Large | 0 | |
| Ocean Springs Middle School | - | Junior | Large | 0 | |
| Ocean View High School | - | Varsity | - | 0 | |
| Oceanside High School | - | Varsity | Large | 0 | |
| Oceanside High School | - | Varsity | Small | 0 | |
| Odessa High School | - | Varsity | - | 0 | |
| Odessa High School | - | Varsity | - | 0 | |
| Odessa High School | - | Varsity | Small | 0 | |
