| Acronym | Definition |
|---|
| IBU | Ibuprofen |
| IBU | International Biathlon Union |
| IBU | International Bitterness Unit |
| IBU | Intel Bios Update |
| IBU | Internal Bus Unit |
| IBU | Inshore Boat Unit (US Navy) |
| IBU | International Boxing Union |
| IBU | International Banking Unit |
| IBU | International Budo University (Japan) |
| IBU | Inland Boatman's Union |
| IBU | Independent Business Unit |
| IBU | Interference Blanker Unit |
| IBU | Irish Bridge Union (card game) |
| IBU | Industrial Bus Lines, Inc. |
| IBU | Ýzzet Baysal Üniversitesi (Turkey) |
| IBU | Ingenieursbureau Utrecht (Dutch: Engineering Utrecht; Netherlands) |
| IBU | Itty Bitty Unit |
| IBU | Intense Benguela Upwelling |
| IBU | Inertia Breaking Unit |
| IBU | Interesting But Unsubstantiated |