| Oak Ridge High School (CA) | - | Junior | Small | 0 | |
| Oakland Middle School | - | Middle School | - | 0 | |
| Oakmont High School | - | - | - | 0 | |
| Oakmont High School | - | - | Large | 0 | |
| Oakville High School | - | Varsity | Large | 0 | |
| Oberlin Magnet Middle School | - | Junior | Large | 0 | |
| Obion County Central High School | - | Varsity | Large | 0 | |
| Oblivion All Stars | L5 | Open | - | 0 | |
| Oblivion Allstars | L5 | International Open | Large | 0 | |
| OC All Stars | L3 | Junior | Large | 0 | |
| OC All Stars | L7 | Open | Large | 0 | |
| OC All Stars | L7 | International Open | Large | 0 | |
| OC Elite | L1 | - | - | 0 | |
| Ocean Springs High School | - | Varsity | Large | 0 | |
| Ocean Springs High School | - | Varsity | Large | 0 | |
| Ocean Springs Middle School | - | Junior | Small | 0 | |
| Ocean Springs Middle School | - | Junior | Large | 0 | |
| Ocean Springs Middle School | - | Junior | Small | 0 | |
| Oceanside High School | - | Varsity | Large | 0 | |
| Oceanside High School | - | Varsity | Large | 0 | |
| Oceanside High School | - | Varsity | Large | 0 | |
| Oceanside High School | - | Varsity | Large | 0 | |
| Ocoee Middle School | - | Junior | Large | 0 | |
| Off Main All Stars | L5 | Senior | Large | 0 | |
| Ogden High School | - | - | Large | 0 | |
| Okanagan Firestorm Cheerleading | L2 | U16 | Large | 0 | |
| Oklahoma State University | - | - | Large | 0 | |
| Oklahoma State University | - | - | Large | 0 | |
| Oklahoma Twisters | L3 | Senior | Large | 0 | |
| Olathe East High School | - | Varsity | Large | 0 | |
| Olathe Northwest High School | - | Junior | - | 0 | |
| Olathe Northwest High School | - | Varsity | Large | 0 | |
| Olathe Northwest High School | - | Varsity | Large | 0 | |
| Olathe Northwest High School | - | Varsity | Large | 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 | Large | 0 | |
| Oldham County High School | - | Varsity | Small | 0 | |
| Oldham County Middle School | - | Junior | Large | 0 | |
| Oldham County Middle School | - | Junior | Large | 0 | |
| Olentangy Berlin High School | - | Varsity | - | 0 | |
| Olentangy Berlin High School | - | Varsity | - | 0 | |
| Oley Valley High School | - | Junior | Large | 0 | |
| Olive Branch High School | - | Varsity | Small | 0 | |
| Olive Branch High School | - | Varsity | - | 0 | |
| Olive Branch High School | - | Varsity | Large | 0 | |
| Olympia Allstar Cheerleading | L1 | U16 | Large | 0 | |
| Olympia Allstar Cheerleading | L3 | Open | Large | 0 | |
