| Acronym | Definition |
|---|
| BO | Body Odor |
| BO | Box Office |
| BO | Bolivia |
| BO | Bologna (Emilia Romagna, Italy) |
| BO | Bulletin Officiel (French) |
| BO | Big O (anime) |
| BO | Best Offer |
| BO | Business Object |
| BO | Bochum (Germany) |
| BO | Belarus |
| BO | Business Office |
| BO | Back Office |
| BO | Business Opportunity |
| BO | Boletín Oficial (Spanish: Official Gazette; Argentina) |
| BO | Barack Obama (44th US president) |
| BO | Blackout |
| BO | Burnout |
| BO | Binary Option (trading) |
| BO | Blue October (band) |
| BO | Biarritz Olympique (French rugby team) |
| BO | Battery Operated |
| BO | Banco de Occidente (Spanish: Western Bank; Honduras) |
| BO | Blow-Off |
| BO | Branch Office |
| BO | Break Off |
| BO | Battle Orders (Diablo 2 game) |
| BO | Back Order |
| BO | Biological Opinion |
| BO | Back Orifice (trojan horse utility) |
| BO | Biodiversity Offsetting (conservation) |
| BO | Black Organization (Detective Conan) |
| BO | Billing Official (US DoD) |
| BO | Buzz Off |
| BO | Boom Operator (USAF in-flight refueling) |
| BO | Blood Omen (game) |
| BO | Body Odour (gaming group) |
| BO | Barrel of Oil (oil and gas exploration) |
| BO | Bowled Over |
| BO | Build Order |
| BO | Bloc Opératoire (French: Operating Room) |
| BO | Blocked Out |
| BO | Bronchiolitis Obliterans |
| BO | Bad Order |
| BO | Bus Operator |
| BO | Breakout Box |
| BO | Bang and Olufsen |
| BO | Bridge Officer (gaming) |
| BO | Binary Output |
| BO | Boletim de Ocorrência (Accident Report; Brazil) |
| BO | Bucked Off (rodeo) |
| BO | Boarding Officer |
| BO | Bilans Otwarcia (opening balance) |
| BO | Buyer's Option |
| BO | Benefits Office |
| BO | Black Ore (Lineage 2 game) |
| BO | Base Order |
| BO | Busy Out |
| BO | Brain Overload |
| BO | Bottom Opened (can collectors) |
| BO | Beneficial Occupancy |
| BO | Budget Obligations |
| BO | Budget Outlay |
| BO | Binary to Octal |
| BO | Born Organized |
| BO | Battle Operations |
| BO | Branchiootic |
| BO | Bruto Oppervlakte (Dutch: Gross Area) |
| BO | Bonus Objective (gaming) |
| BO | Blocking Oscillator |
| BO | Bench Order |
| BO | Base-Out Prism |
| BO | Bloody Orchid (Lineage 2 game) |
| BO | Branch on Overflow (IBM) |
| BO | Bowel Opening (anatomy) |
| BO | Barring Order |
| BO | Borrow Output (electrical circuits) |
| BO | Booster Orbiter |
| BO | Beat Oscillator |
| BO | Bit Oxide |
| BO | Bachelor of Oratory |
| BO | Branch on Ones (IBM) |
| BO | Buffer Overflow/Overrun |
| BO | Bearing Observed |
| BO | Bom Pra Otário (Brazil) |
| BO | Bourget-Opéra (French) |