| Acronym | Definition |
|---|
| MWI | Malawi (ISO Country code) |
| MWI | Mobile Web Initiative (World Wide Web Consortium) |
| MWI | Message-Waiting Indicator (telecommunications) |
| MWI | Memory Write Invalidate |
| MWI | Message Waiting Indication |
| MWI | Mobile Web Initiative |
| MWI | Many-Worlds Interpretation (Quantum Physics, Quantum Mechanics) |
| MWI | Ministry of Water and Irrigation |
| MWI | Medical Waste Incinerator |
| MWI | microwave irradiation |
| MWI | Media Wearout Indicator (computing) |
| MWI | Mafia Wars Indonesia (gaming clan) |
| MWI | Marriage Witness Index (UK) |
| MWI | Microwave Imaging |
| MWI | Mountain Wilderness International |
| MWI | Mad Wae It! |
| MWI | Medical Waste Institute |
| MWI | Magee Womancare International (Pittsburgh, PA; free preventive healthcare) |
| MWI | Mad With It (intoxicated) |
| MWI | Missouri Watershed Initiative |
| MWI | Manufacturing Work Instruction |
| MWI | Managing for Weekly Improvement |
| MWI | Met While Incarcerated |
| MWI | Management Work Instruction |