| W | West |
| W/Cdr | Wing Commander |
| WA | Western Australia; Washington |
| WAAF | Women's Auxiliary Air Force (later WRAF) |
| Warwicks | Warwickshire |
| Wash | Washington State |
| WCC | World Council of Churches |
| WEA | Workers' Educational Association; Royal West of England Academy |
| WEU | Western European Union |
| WFTU | World Federation of Trade Unions |
| WHO | World Health Organization |
| WI | West Indies; Women's Institute; Wisconsin |
| Wilts | Wiltshire |
| Wis | Wisconsin |
| WLA | Women's Land Army |
| Wm | William |
| WMO | World Meteorological Organization |
| WNO | Welsh National Opera |
| WO | Warrant Officer; War Office |
| Worcs | Worcestershire |
| WR | West Riding; Western Region (British Railways) |
| WRAC | Women's Royal Army Corps |
| WRAF | Women's Royal Air Force |
| WRANS | Women's Royal Australian Naval Service |
| WRNS | Women's Royal Naval Service |
| WRVS | Women's Royal Voluntary Service |
| WS | Writer to the Signet |
| WSPU | Women's Social and Political Union |
| WV | West Virginia |
| WVS | Women's Voluntary Services |
| WW | World War |
| WWF | World Wide Fund for Nature (formerly World Wildlife Fund) |
| WY | Wyoming |