| Abbreviation | Definition |
|---|---|
| OHSB | Occupational Health and Safety Bureau |
| OIB | Ocean Isle Beach |
| OID | Office for Individuals with Disabilities |
| OID | Oklahoma Insurance Department |
| OIDMTC | Ontario Interactive Digital Media Tax Credit |
| OIFY | Once in five years (a once-in-five-years political transition) |
| OIO | Office Of The Insurance Ombudsman |
| OIRP | Office of International Relations and Protocol |
| OITD | Oaklands Innovative Technologies District |
| OJA | Office of Justice Assistance |
| OJP | Office of Justice and Peace |
| OKC | Oklahoma City |
| OKL | Okanagan Landing |
| OKR | Okanagan Region |
| OKW | Old Key West |
| OKY | Owensboro, Kentucky |
| OLAF | Ohio Legal Assistance Foundation |
| OLCC | Oregon Liquor Control Commission |
| OLE | Office of Law Enforcement |
| OLE | Overhead Line Electrification |