| Acronym | Definition |
|---|
| MUI | Multilingual User Interface (Microsoft) |
| MUI | Mastered Ultra Instinct |
| MUI | Majelis Ulama Indonesia (Indonesian Ulemas Council) |
| MUI | Multilingual User Interface |
| MUI | Manager User Interface |
| MUI | Mobile User Identity |
| MUI | Multi User Interface |
| MUI | Migrating User Interface |
| MUI | Macromedia User Interface |
| MUI | Magic User Interface (Amiga user interface system) |
| MUI | Minnesota Utility Investors (est. 1990) |
| MUI | Multi-User Interference |
| MUI | Mixed Urinary Incontinence |
| MUI | Middle to Upper Income |
| MUI | Modello Unico Informatico (Italian: Unique Information Model) |
| MUI | Major Unusual Incident |
| MUI | Multimedia User Interface |
| MUI | Manual User Interface (hardware control panel) |
| MUI | Mechanical Unit Injector |