| Acronym | Meaning |
| MEW | Marine Early Warning |
| MEW | Marine Expeditionary Force |
| MEW | Marine Expeditionary Wing |
| MEW | Microwave Early Warning |
| MEW | Middlefield-Ellis-Whisman (Superfund Study Area; US EPA) |
| MEW | Ministry of Economic Warfare |
| MEW | Ministry of Electricity and Water |
| MEW | Ministry of Energy and Water |
| MEW | Ministry of Environment and Water (various locations) |
| MEW | Mobile Early Warning |
| MEW | Multi-Employer Worksite (US Army) |