| Abbreviation | Definition |
|---|---|
| OFSY | Om Factory School of Yoga |
| OGHS | Oak Glen High School |
| OGHS | Orange Glen High School |
| OGHS | Otago Girls' High School |
| OGHS | Ottawa-Glandorf High School |
| OGPS | Ocean Grove Primary School |
| OGS | Oak Grove School |
| OGS | Omega Graduate School |
| OGS | Oxford Graduate School |
| OHDS | Oakland Hebrew Day School |
| OHF | Oak Hills Elementary school |
| OHHS | Oak Harbor High School |
| OHHS | Oak Hill High School |
| OHHS | Oak Hills High School |
| OHHS | Oxon Hill High School |
| OHLS | Osgoode Hall Law School |
| OHMS | Oak Harbor Middle School |
| OHMS | Oquirrh Hills Middle School |
| OHMS | Oxford Hills Middle School |
| OHS | Oakdale High School |