| Abbreviation | Definition |
|---|---|
| O | Onions |
| O | Order |
| O | Overcooked |
| OASIS | Ornaments And Specialty Ingredients Source |
| OB | Orange Blotch |
| OB | Oriental Beer |
| OB | Oriental Brewing |
| OB | Owl Bait |
| OBS | Old Brandy Stunt |
| OC | Oatmeal Cookie |
| OC | Orange Crush |
| OC | Original Combo |
| OC | Ostrich Cookies |
| OD | Orange Drink |
| ODA | Optimal Daily Allowance |
| OFB | Oregon Food Bank |
| OFC | Organic Food Chain |
| OFH | Ozarks Food Harvest |
| OFN | Open Food Network |
| OFP | Ontario Food Panel |