| Abbreviation | Definition |
|---|---|
| OASIS | Open Access to State Information and Services |
| OASIS | Operater Assisted Sewer Information System |
| OASYS | Ontario Assessment System |
| OB | Ocean Beach |
| OBC | Ontario Building Code |
| OBE | Old Bridge Estates |
| OBHECC | Ontario Broiler Hatching Egg & Chick Commission |
| OBI | Open Budget Index |
| OBIP | Ontario Basic Income Pilot |
| OBM | Office of Budget and Management |
| OBN | Oklahoma Bureau Narcotics |
| OBPTC | Ontario Book Publishing Tax Credit |
| OBR | Office of Banks and Real Estate |
| OBSP | Ontario Breast Screening Program |
| OBT | OakBrook Terrace |
| OBWC | Ohio Bureau of Workers Compensation |
| OBX | Outer Banks North Carolina |
| OBX | Outer Banks, North Carolina |
| OC | Ocean Cove |
| OC | Okeechobee County |