W3

W3 or W-3 may refer to:

W3 (tram), a class of electric trams built by the Melbourne & Metropolitan Tramways Board
W3, a postcode district in the W postcode area
Apple W3, a wireless chip used in the Apple Watch Series 4.
PZL W-3 Sokół, a Polish helicopter
The Amazing 3, a manga and anime series, known in Japan as Wonder 3
Arik Air, which has IATA code W3
The fourth step of the W0-W6 scale for the classification of meteorites by weathering
The U.S. Internal Revenue Service form W-3, a transmittal form for Form W-2 information
Webster's Third New International Dictionary, the 1961 edition of Webster's Dictionary
The World Wide Web, abbreviated 'W3' on the earliest web pages
World Wide Web Consortium, international standards organization for the World Wide Web (abbreviated WWW or W3)
Windows 3.0, a Microsoft operating system

Video games

Warcraft III: Reign of Chaos, the third game in the Warcraft series.
Worms & Reinforcements United, a game bundle composing the first Worms game and the Worms Reinforcements expansion pack
Wiedźmin 3: Dziki Gon, the original name of the Polish video game The Witcher 3: Wild Hunt