| Acronym | Meaning |
| W | Indefinite Ceiling (weather reports) |
| W | London West (postcode, United Kingdom) |
| w | Search Subarea Width (US DoD) |
| W | Sweep Width |
| W | Wait(ing) (action code) |
| W | Waiver |
| W | Warhead (designator) |
| W | Warm (air mass) |
| W | Warrant (Officer) |
| W | Waste |
| W | Watchkeeping in duty roster (for ACG duties) |
| W | Weather (US military aircraft modified mission symbol) |
| W | West Point, New York (mint mark on old coins) |
| W | Whiskey (aviation letter code) |
| W | Wien (English: Vienna) |