| W | West |
| Winter zone load line mark |
| W x N | West by north |
| W x S | West by south |
| W/T | Wireless telegraphy |
| WAC | Weapon-aiming computer |
| WADS | Weapon access delays system |
| WAN | Wide area network |
| WAP | Wireless application protocol |
| WARC | World Administrative Radio Conference |
| WB | Water ballast |
| WBM | Wave bending moment |
| WBS | Work breakdown structure |
| WCL | World Confederation of Labour |
| WDF | Wireless direction finding |
| WDk | Weather deck |
| WE | War establishment |
| WECA | Wireless Ethernet Compatibility Alliance |
| WECDIS | Warship electronic chart display and information system |
| WEND | World electronic navigational chart database |
| WEZ | Weapons engagement zone |
| WFTU | World Federation of Trade Unions |
| WFZ | Weapons fire zone |
| WG | Working group |
| WGS | World geodetic system |
| wh | Wheeled |
| whf | Wharf |
| WHO | World Health Organisation (UN) |
| whse | Warehouse |
| WI | Wrought iron |
| WIMAX | Worldwide interoperability for microwave access (telephony) |
| WIMP | Window, icon, mouse, pointer (computer) |
| WIP | Work in progress |
| wksp | Workshop |
| WLAN | Wireless local area network |
| WLC | Whole-life cost |
| WMARC | World Maritime Administrative Radio Conference |
| WMD | Weapons of mass destruction |
| WMED | World mean elevation data |
| WML | Wireless markup language |
| WMO | World Meteorological Organisation |
| WMR | War maintenance reserve |
| WNW | West-north-west |
| WO | Warrant officer |
| wob | Washed overboard |
| WORM | Write once, read many (computer) |
| WP | Water plane |
| Word processor |
| Working paper |
| Working party |
| wpm | Words per minute |
| WPP | Weapons production programme |
| WPR | Wartime personnel requirements |
| WRA | Weapon-replaceable assembly |
| WRM | War reserve material |
| WRS | War reserve stock |
| WS | Weapons system |
| Work sheet |
| WSA | Weapon System Agency |
| WSDL | Web service description language |
| WSFL | Web service flow language |
| WSI | Wind shear indicator |
| WSIA | Weapon System Integration Authority |
| WSLC | Weapon system life cycle |
| WSS | Weapon storage site |
| WSW | West-south-west |
| WT | Watertight |
| Wireless telegraphy |
| wt | Weight |
| WTB | Water tube boiler |
| WTO | World Trade Organisation |
| WVS | World vector shoreline |
| WWMCCS | World-wide military command control system |
| WWNWS | World-wide navigation warning service |
| WWW | World Weather Watch (of WMO) |
| World-wide web |
| WYSIWYG | What you see is what you get (computer) |
