W5

W5, W-5 or W.5 may refer to:

Arts, entertainment and media

 * W5 (TV program), a Canadian television news program
 * Nick News W/5, the original title of Nick News, an educational TV show

Science and technology

 * W5 (nuclear warhead) of the Mark 5 nuclear bomb
 * W5 clock, built by Philip Woodward
 * W5, a Motorola ROKR mobile phone
 * W5, a radio source in the Westerhout 5 nebula
 * W5, in the classification of meteorite weathering
 * DSC-W5, a Sony Cyber-shot camera
 * Eutelsat W5, a telecommunications satellite

Transportation and military

 * Albatros W.5, a World War I German floatplane torpedo bomber
 * Cierva W.5, a British helicopter from 1938
 * Wittman W-5 Buttercup, a 1938 aircraft
 * London bus route W5
 * Roewe W5, a Chinese car
 * W5 series of road signs in the United States
 * W5, a station of the Hiroden Hakushima Line in Hiroshima, Japan
 * W5, IATA airline code for Mahan Air
 * W5 tram, a class of electric trams built by the Melbourne & Metropolitan Tramways Board
 * W5, station code for Hamilton E. Holmes station

Other uses

 * Five Ws: Who? What? When? Where? and Why?
 * "Which Was What Was Wanted", an alternative to Q.E.D.
 * W5, part of Odyssey Complex, a sports and entertainment complex in Belfast, Northern Ireland
 * W5, a postcode district in the W postcode area of London
 * W.5, Asholt Wood, Kent, a Nature Conservation Review site
 * World version W5, a kickboxing promotion