4W or 4-W may refer to:
Units of measurement 4°W, or 4th meridian west, a longitude coordinate 4 watts 4 weeks 4 wins, abbreviated in a Win–loss record (pitching)
Transportation SLC-4W, designation for one of two launch pads at Vandenberg Air Force Base Space Launch Complex 4 AD-4W, a model of Douglas A-1 Skyraider 4-wheel vehicle, especially vehicles with four wheel drive BP-4W, a model of Mazda B engine 4w (locomotive), a type of locomotive under the Whyte notation
Other 04W, a designation for Typhoon Nina (1975) 4W, the production code for the 1977 Doctor Who serial The Sun Makers
See also W4 (disambiguation)