| OBO | Obihiro, Japan 
| Others |
| OBO | Objecting Beneficial Owner
| Others |
| OBO | Off By One
| Others |
| OBO | Office of Business Operations
| Others |
| OBO | Office of Business Opportunities
| Others |
| OBO | Office of Business Opportunity
| Others |
| OBO | Office of Business Oversight
| Others |
| OBO | Oh Baby Oh
| Others |
| OBO | Oil Bulk Ore
| Others |
| OBO | Old Brick Outlet
| Others |
| OBO | Olfactive Body Object
| Others |
| OBO | On behalf of
| Others |
| OBO | On Behalf Of OBO
| Others |
| OBO | One Behind the Other
| Others |
| OBO | One By One
| Others |
| OBO | Open Ball Operator
| Others |
| OBO | Open Biomedical Ontologies
| Others |
| OBO | Operation Burrowing Owl
| Others |
| OBO | Or Best Offer
| Others |
| OBO | Or Bet Offer
| Others |
| OBO | Ore Bulk Oil
| Others |
| OBO | Ore-Bulk-Oil ship type
| Others |
| OBO | Oregon Board of Optometry
| Others |
| OBO | Original Bets Only
| Others |
| OBO | Our Best Offer
| Others |
| OBO | Output Back-Off
| Others |
| OBO | Overseas Building Office
| Others |
| OBO | Overseas Building Operations
| Others |
| OBO | Overseas Buildings Operations
| Others |
| OBO | Overweight Bait Omens
| Others |
| OBO | Owned By Owner
| Others |
| OBO | Oxford Bibliographies Online
| Others |