W6

W6 may refer to:


 * W6 (tram), a class of electric trams built by the Melbourne & Metropolitan Tramways Board.
 * a particular width for a structural steel I-beam
 * a postcode district in the W postcode area
 * Wizz Air (IATA code W6)
 * 7th step of the W0-W6 scale for the classification of meteorites by weathering
 * W6 (loading gauge) on the British rail network
 * Weltmeister W6, a Chinese car