4W

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