| Abbreviation | Definition |
|---|---|
| OC | Original Credit |
| OC | Other Category |
| OC | Other Characters |
| OC | Over Commercialized |
| OCC | Obligatory Cinema Content |
| OCC | Original Character Creation |
| OCM | On Camera Meteorologist |
| OCM | Online Courses Magazine |
| OCM | Orihuela Costa Magazine |
| OCMA | Oklahoma Collegiate Media Association |
| OCN | Original Color Negative |
| OCNA | Ontario Community Newspapers Association |
| OD | On Demand |
| OD | Over-Dubbed |
| ODAT | One Day At a Time |
| ODEON | Oscar Deutsch Entertains Our Nation |
| ODM | On Digital Media |
| ODM | Ordo De Malleus ('Order of the Hammer' in High Gothic) |
| ODSM | Optical Data Storage Media |
| ODT | Otago Daily Times |