| Abbreviation | Definition |
|---|---|
| ODX | Old Dominion X Press |
| OEF | Oxford Energy Forum |
| OET | Opinion Editor Time |
| OF | Otechestven Front |
| OFA | Old Farmers Almanac |
| OFC | Original Female Character |
| OFCS | Online Film Critics Society |
| OFF | Our Favorite Family |
| OFN | Oregon Flora Newsletter |
| OFOCN | One Flew Over the Cuckoo's Nest (Movie) |
| OFP | Online Financial Publication |
| OFS | Olympia Film Society |
| OFT | Old Fogey Tales |
| OG | Official Gazette |
| OGA | On Good Authority |
| OGC | ObsGynCom magazine |
| OGFF | Only Good For FRENETICISM |
| OGT | Official Gazette of the United States Patent and Trademark Office |
| OHC | Ohio History Central |
| OHP | OverHead Projector |