| BOO | Baby Orphan Orca 
| Others |
| BOO | Baby Orphaned Orca
| Others |
| BOO | Balance On Order
| Others |
| BOO | Bash Object Oriented
| Others |
| BOO | Bats Orange and October
| Others |
| BOO | Battery Operated Orchestra
| Others |
| BOO | Before Onyone Olse
| Others |
| BOO | Bethesda Online Organization
| Others |
| BOO | Better Off Out
| Others |
| BOO | Binary Organic Optimization
| Others |
| BOO | Birds of Oregon
| Others |
| BOO | Bladder Outflow Obstruction
| Others |
| BOO | Bladder outlet obstruction
| Others |
| BOO | Blizzard Of Ozz
| Others |
| BOO | Blue Ocean Obessed
| Others |
| BOO | Blue Ocean Obsessed
| Others |
| BOO | Bodo, Norway
| Others |
| BOO | Body Odor Optimal
| Others |
| BOO | BOO Encoded file archive (ASCII)
| Others |
| BOO | Book (IBM BookManager)
| Others |
| BOO | Bootstrap (Kermit protocol binary file)
| Others |
| BOO | Born of Osiris
| Others |
| BOO | Brake On Off
| Others |
| BOO | Brake On/Off
| Others |
| BOO | Bravo Owners Organisation
| Others |
| BOO | Build Operate Own
| Others |
| BOO | Build Our Own
| Others |
| BOO | Build Own And Operate
| Others |
| BOO | Build Own Operate
| Others |
| BOO | Build, Own, Operate
| Others |
| BOO | Business Office Online
| Others |
| BOO | Business Operations Office
| Others |
| BOO | Business Output Optimization
| Others |