| Ocean View High School | - | Varsity | - | 0 | | |
| Oceanside High School | - | Varsity | Large | 0 | | |
| Oceanside High School | - | Varsity | Large | 0 | | |
| Oceanside High School | - | Varsity | Large | 0 | | |
| Oceanside High School | - | Varsity | - | 0 | | |
| Odessa High School | - | Varsity | - | 0 | | |
| Odessa High School | - | Varsity | - | 0 | | |
| Odessa High School | - | Varsity | - | 0 | | |
| Odessa High School | - | Varsity | Small | 0 | | |
| Odyssey Institute for Adv & Int | - | Varsity | - | 0 | | |
| Odyssey Institute For Advanced & Interna | - | Varsity | Small | 0 | | |
| Ogden High School | - | Varsity | Small | 0 | | |
| Okeechobee High School | - | Varsity | Small | 0 | | |
| Olathe East High School | - | Varsity | Large | 0 | | |
| Olathe East High School | - | Varsity | - | 0 | | |
| Olathe Northwest High School | - | Varsity | Large | 0 | | |
| Olathe Northwest High School | - | Varsity | Medium | 0 | | |
| Olathe Northwest High School | - | Varsity | - | 0 | | |
| Olathe Northwest High School | - | Varsity | Large | 0 | | |
| Olathe Northwest High School | - | Junior | - | 0 | | |
| Olathe Northwest High School | - | Varsity | - | 0 | | |
| Olathe Northwest High School | - | Varsity | Large | 0 | | |
| Olathe West High School | - | Varsity | Medium | 0 | | |
| Olathe West High School | - | Varsity | Large | 0 | | |
| Old Bridge High School | - | Varsity | Small | 0 | | |
| Old Bridge High School | - | Varsity | Small | 0 | | |
| Old Bridge High School | - | Varsity | Large | 0 | | |
| Old Bridge High School | - | Varsity | Small | 0 | | |
| Old Mill High School | - | Varsity | - | 0 | | |
| Oldham County High School | - | Varsity | Medium | 0 | | |
| Oldham County High School | - | Varsity | Small | 0 | | |
| Olentangy Berlin High School | - | Varsity | - | 0 | | |
| Olentangy Berlin High School | - | Varsity | Large | 0 | | |
| Oley Valley High School | - | Junior | - | 0 | | |
| Oley Valley High School | - | Varsity | - | 0 | | |
| Oley Valley High School | - | Varsity | Small | 0 | | |
| Oley Valley High School | - | Varsity | Medium | 0 | | |
| Oley Valley High School | - | Varsity | - | 0 | | |
| Olive Branch High School | - | Varsity | Small | 0 | | |
| Olive Branch High School | - | Varsity | - | 0 | | |
| Olive Branch High School | - | Varsity | Large | 0 | | |
| Olive Branch High School | - | Varsity | Medium | 0 | | |
| Olive Branch High School | - | Varsity | Medium | 0 | | |
| Olive Branch High School | - | Varsity | - | 0 | | |
| Olympia High School | - | Varsity | - | 0 | | |
| Olympic Heights Comm HS | - | Varsity | Large | 0 | | |
| Olympic Heights Comm HS | - | Varsity | Small | 0 | | |
| Olympic Heights Community High School | - | Varsity | Small | 0 | | |
| Olympus High School | - | Varsity | Large | 0 | | |
| Olympus High School | - | Junior Varsity | - | 0 | | |