| B&O | Baltimore & Ohio 
| Others |
| B&O | Baltimore and Ohio Railroad
| Others |
| B&O | Bang & Olufsen
| Others |
| B&O | Bang and Olufsen
| Others |
| B&O | Belladonna and Opium
| Others |
| B&O | Bullets and Octane
| Others |
| B&O | Business and occupation tax
| Others |
| b.o. | Body Odor
| Others |
| B.O. | Buyer's Order
| Others |
| B.O. | By Other
| Others |
| b/o | back order(ed)
| Others |
| b/o | back-order(ed)
| Others |
| B/O | Best Offer
| Others |
| B/O | Booster / Orbiter
| Others |
| B/O | BreakOut
| Others |
| B/O | BurnOut
| Others |
| B/O | Bypass/Overflow
| Others |
| B/O | On Behalf Of ....
| Others |
| BO | Baby Oil
| Others |
| BO | Bachelor of Osteopathy
| Others |
| BO | Back Office
| Others |
| BO | Back Order
| Others |
| BO | Back Orifice
| Others |
| BO | Bad Order
| Others |
| BO | Baltimore and Ohio Railroad (CSX Transportation)
| Others |
| BO | Bank of the Ozarks
| Others |
| BO | Bank Officer
| Others |
| BO | Barack Obama
| Others |
| BO | Barack Obiden
| Others |
| BO | Baron's Online
| Others |
| BO | Barrack Obama
| Others |
| BO | Barrel of Oil
| Others |
| BO | Base of Operations
| Others |
| BO | base out Ophthalmology
| Others |
| BO | Basic Object
| Others |
| BO | BasiOccipital
| Others |
| BO | bby Odor
| Others |
| BO | Be Original
| Others |
| BO | Beacon Order
| Others |
| BO | Bed Only
| Others |
| BO | Belief Optimization
| Others |
| BO | Benjamin Oscar
| Others |
| BO | Benjamin Owen
| Others |
| BO | BenzOyloxime
| Others |
| BO | Best Out
| Others |
| BO | Bez Onake
| Others |
| BO | Bez Oznake
| Others |
| BO | Biden Odor
| Others |
| BO | Big O
| Others |
| BO | Big Orchid
| Others |
| BO | Binary Operation
| Others |
| BO | Binary Option
| Others |
| BO | Binary Output
| Others |
| BO | Bind Off
| Others |
| BO | Biological Origin
| Others |
| BO | Black Ops
| Others |
| BO | Black Out
| Others |
| BO | Blacked Out
| Others |
| BO | Blue One
| Others |
| BO | bo or
| Others |
| BO | Board of Ordnance
| Others |
| BO | Bob Otis
| Others |
| BO | Bocek OlduruCu
| Others |
| BO | Bodacious Our
| Others |
| BO | Body Odour
| Others |
| BO | Boeing
| Others |
| BO | Bog Off
| Others |
| BO | Bologna
| Others |
| BO | Bombed Out
| Others |
| BO | Born Oppenheimer
| Others |
| BO | Born Organized
| Others |
| BO | Boss Of
| Others |
| BO | Bottle Opener
| Others |
| BO | bowel
| Others |
| BO | Bowel Obstruction
| Others |
| BO | Bowel Open
| Others |
| BO | Box Office
| Others |
| BO | Branch Office
| Others |
| BO | BreakOut box
| Others |
| BO | Breathing Organ
| Others |
| BO | Bridging Oxygen
| Others |
| BO | Bronchial Obliterans
| Others |
| BO | Bucco-Occlusal
| Others |
| BO | Buddy Owen
| Others |
| BO | Budget Office
| Others |
| BO | Budget Outlay
| Others |
| BO | Buick Open Golf Tournament
| Others |
| BO | Build Order
| Others |
| BO | Bulletin Officiel
| Others |
| BO | Burned Out
| Others |
| BO | Bus Out
| Others |
| BO | Business Object
| Others |
| BO | Business Objects
| Others |
| BO | Business Office
| Others |
| BO | Tibetan
| Others |