| Abbreviation | Definition |
|---|---|
| OFCAF | On-Farm Climate Action Fund |
| OFDC | Ontario Film Development Corporation (superseded by CMDC) |
| OFI | Office of Financial Institutions |
| OFIDP | Ontario Farm Income Disaster Program |
| OFM | Office Files and Memoranda |
| OFM | Office of the Fire Marshal |
| OFM | Ontario Fire Marshall |
| OFO | Office of Fiscal Operations |
| OFT | New York State Office for Technology |
| OFTTC | Ontario Film and Television Tax Credit |
| OGB | Oil and Gas Board |
| OGC | Office of Government Commerce |
| OGC | Oil and Gas Conservation |
| OGD | Ogdensburg, New York |
| OGNB | Ontario Geographic Names Board (Ontario government board that determines official names for places in Ontario) |
| OGS | Office of General Services |
| OGSG | Ogun State Government |
| OGT | Office of Greenways and Trails |
| OH | Oak Hill |
| OHA | Office of Hawaiian Affairs |