W11
W11 may refer to:

Aircraft 
 Cierva W.11 Air Horse, a British helicopter
 Hansa-Brandenburg W.11, a German fighter floatplane
 Wolf W-11 Boredom Fighter, an American biplane

Automobiles 
 Mercedes-Benz W11, a German roadster
 Mercedes-AMG F1 W11 EQ Performance, a racing car
 Nissan Avenir (W11), a station wagon

Other uses 
 British NVC community W11, in the British National Vegetation Classification system
 Cuboctahedron
 LB&SCR A1X Class W11 Newport, a steam locomotive
 London Buses route W11
 W11 Opera, a British opera company
 Windows 11, an operating system
 Winning Eleven, a soccer simulation game
 W11, a postcode district in London, England