WA ~ Woolwich Arsenal

WAFF ~ West African Field Force

WAAC ~ Women's Auxiliary Army Corps

WCSC ~ Works Construction Sub Committee

WD ~ War Department

WE ~ War Establishment

WG ~ Welsh Guards

WI ~ Wrought Iron

WIA ~ Wounded in Action

WIR ~ West India Regiment

WL ~ Women's Legion

WLA ~ Women's Land Army

WMD ~ Wounded & Missing Department (BRCS)

WMV ~ War Munitions Volunteer (scheme) 

WO ~ War Office

WO ~ Warrant Officer

WOE & M ~ Works Officer, Electrical & Mechanical

WOTP ~ War Office Tank Programme

WPC ~ War Priorities Committee

WPMR ~ Western Province Mounted Rifles (South Africa)

WRA ~ War Risk Associations

WRC ~ War Railway Council

WRD ~ Wagon Repair Depot

WRNS ~ Women's Royal Naval Service

WSPU ~ Women's Social & Political Union (suffragettes)

WT ~ Wireless Telegraphy

WTID ~ War Trade Intelligence Department

WVMC ~ Women Volunteer Motor Corps

WVMDC ~ Women Volunteer Motor Drivers Corps

WW ~ Walking Wounded

WWCP ~ Walking Wounded Collecting Post

WWCS ~ Walking Wounded Collecting Station