W3 or W-3 may refer to:
- W3, a postcode district in the W postcode area
- World Wide Web Consortium (w3.org), international standards organization for the World Wide Web (abbreviated WWW or W3)
- PZL W-3 Sokół, a Polish helicopter
- The Amazing 3, a manga and anime series, known in Japan as Wonder 3
- Webster's Third New International Dictionary, the 1961 edition of Webster's Dictionary
- Arik Air, IATA code W3
- The U.S. Internal Revenue Service form W-3, a transmittal form for W-2 information
- 4th step of the W0-W6 scale for the classification of meteorites by weathering
- 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
- Wolfenstein 3D, the third game in the Wolfenstein series
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