| Acronym | Meaning |
 | WHO | World Health Organisation |
| WHS | (U.S.) Washington Headquarters Services |
| WI | Western Sahara (FIPS 10-4 Country Code) - Wisconsin (postal Symbol) |
| WIA | Wounded In Action |
| WIMP | Weakly Interacting Massive Particle - Windows |
| WIN | T -Warfighter Information Network-Tactical |
| WIPO | World Intellectual Property Organization |
| WIPP | [Nuclear] Waste Isolation Pilot Project |
| WIYN | Wisconsin Indiana Yale NOAO Telescope Consortium |
| WK | Wake Island (ISO 3166 Digram |
| WKYP | Will Keep You Posted |
| WL | Wehrmacht Luftwaffe (German WW2 Air Force Vehicle Licence Plate Code) |
| WLB | Women's Land Brigade (WWII Canada) |
| WLF | Wallis And Futuna Islands (ISO 3166 Trigram) |
| WLN | Walloon Language (ISO 639-2 Code) |
| WLOG | Without Loss Of Generality (see WOLOG) |
| WM | Wehrmacht Marine (German WW2 Navy Vehicle Licence Plate Code) |
| WMANUS | West Midlands Area National Union Of Students |
| WMD | Weapon[s] Of Mass Destruction - World Movement For Democracy ? |
| WMI | Wildlife Management Institute |
| WMO | World Meteorological Organization |
| WNA | World Nuclear Association |
| WNF | Will Not Fix |
| WNSD | What's New |
| WNW | West North-West |
| WO | Warrant Officer |
| WO | Wolof Language (ISO 639-1 Code) |
| WOL | Wolof Language (ISO 639-2 Code) |
| WOLOG (OR WLOG) | WithOut Loss Of Generality |
| WOM | Write Only Memory (a Joke From Stan Kelly-Bootle) |
| WOS | Wilson Ornithological Society |
| WOT | Waste Of Time |
| WP | White Phosphorus (ammunition) |
| WPB | War Production Board During World War II |
| WPE | World Pork Expo |
| WPK | Wider Peacekeeping |
| WR | Wide Receiver (football) |
| WRAC | Women's Royal Army Corps (WWII UK) |
| WRAIR | Walter Reed Army Institute Of Research |
| WRBWWRM | We Read Best What We Read Most |
| WRC | World Rally Championship |
| WRNS | Women's Royal Naval Service (WWII UK) (pronounced Wrens) |
| WRS | Worldwide Reference System |
| WRT | With Respect To |
| WRT | Writer Response Theory |
| WRT | World Rally Team |
| WRT OR W/R/T | With Respect To Or With Regard To |
| WRVS | Women's Royal Voluntary Service |
| WS | Samoa (ISO 3166 And FIPS 10-4 Country Code Digram; From West Samoa) -Writer To The Signet (a Scottish Solicitor) |
| WSC | Weapon System Catalogue |
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