| Abbreviation | Definition |
|---|---|
| OBW | Original Bank Wrapped |
| OBW | Outer Banks Windsurfing |
| OBWC | Outer Banks Woman's Club |
| OCBC | Oversea Chinese Banking Corp |
| OCBC | Oversea Chinese Banking Corporation |
| OCC | Open Cash Credit |
| OCTB | Orange County Time Bank |
| OD | Over Draft |
| ODB | Oman Development Bank |
| ODBL | Om Development Bank Ltd |
| ODC | Offshore Development Centre |
| ODI | Over-Due Interest |
| ODNB | Old Dominion National Bank |
| OE | Originating Entry |
| OENB | Österreichische Nationalbank |
| OFB | One Fathom Bank |
| OFW | Overseas Filipinos Worldwide Bank |
| OIB | Office of Investments and Banking |
| OIB | Ouachita Independent Bank |
| OIBG | One Investment Banking Group |