| Acronym | Definition |
|---|
| BOO | Blood of Olympus (fiction) |
| BOO | Board of Officers (various organizations) |
| BOO | Build-Own-Operate |
| BOO | Base of Operations |
| BOO | Bladder Outlet Obstruction |
| BOO | Born of Osiris (band) |
| BOO | Build-Operate-Own (Project) |
| BOO | Blizzard of Ozz (Ozz Osbourne album) |
| BOO | Business Office Online (marketing system) |
| BOO | Bladder Outflow Obstruction |
| BOO | Battle of Olympus (video game) |
| BOO | Brake On/Off switch |
| BOO | Bodo, Norway - Bodo (Airport Code) |
| BOO | Back Office Operation (various companies) |
| BOO | Brandeis Orthodox Organization |
| BOO | Business Operations Office |
| BOO | Balance on Order |
| BOO | Brewers Of Ontario (Canada) |
| BOO | Battalion Orderly Officer |