| Acronym | Definition |
|---|
| MUG | Macintosh User Group |
| MUG | Maple User Group |
| MUG | Microsoft User Group |
| MUG | Macintosh Users Group |
| MUG | Manhattan User's Guide (resource; New York) |
| MUG | Microsoft User Group (various locations) |
| MUG | Multi-User Game |
| MUG | Mauritius Underwater Group (diving club) |
| MUG | 4-Methylumbelliferyl-ß-D-Glucuronide (substrate) |
| MUG | Motorcycle User Group (various locations) |
| MUG | Macromedia User Group (software) |
| MUG | Male Unbifurcated Garment (alternative to trousers) |
| MUG | Mobiele Urgentiegroep (Mobile Urgence Group; special ambulance team) |
| MUG | Mechanics, Usage, Grammar (education) |
| MUG | Multi-User Group |
| MUG | Midshipman Under Guidance |
| MUG | Make-Up Gas |
| MUG | Minimum Usage Guarantee (voice and data plans) |
| MUG | Manning Unit Group |
| MUG | Microcomputer User's Group |
| MUG | MATE Users Group |