| Abbreviation | Definition |
|---|---|
| ODLB | Olivier De Los Bueis |
| OH | Old Hickory |
| OHM | One Hot Mama |
| OICG | Okay It's Childish Gambino |
| OJ | Old John |
| OJ | Olive Jane |
| OJ | Oliver James |
| OJ | Orange Julius |
| OJ | Orion, Junior |
| OJ | Orrin Judd |
| OJ | Oscar James |
| OJ | Oscar Jesus |
| OJ | Oscar Jones |
| OJ | Oscar Junior |
| OJ | Oscar Justin |
| OLA | Our Lady of the Angels |
| OLB | Omaha, Lincoln Beatrice Railway |
| OLB | Omaha, Lincoln & Beatrice Railway |
| OLOCA | Official List Of Cygwin Acronyms |
| OM | Other Mother |