SW, sw or s/w may stand for:
Companies
- Air Namibia, IATA airline code
 - Sierra Wireless, Inc., TSX
 - Silk Way Airlines, an Azerbaijani private cargo airline
 - Slimming World, a weight loss company
 - Smith & Wesson, S&W, a firearms manufacturer
 - Southern Winds Airlines, a defunct Argentine airline
 - Southwestern Company, a publishing company designed for college students
 
Geography
- Southwest, one of the four ordinal directions
 - Sweden (FIPS country code SW)
 - SW postcode area, southwest London, England
 - Schweinfurt, Bavaria, Germany, vehicle registration code
 - Swietochlowice, Silesian Voivodeship, Poland, vehicle registration code
 
Occupations
- Steelworker (US Navy), an occupational rating
 - Enlisted Surface Warfare Specialist, a US Navy occupational rating
 - Sex worker
 
Science and technology
Computing and telecommunications
- Shortwave radio band, 1.6–30 MHz
 - Shortwave radiation, in visible and near visible bands
 - Smith–Waterman algorithm, algorithm for performing local sequence alignment
 
Other uses in science and technology
- Sport wagon or crossover, an automobile configuration
 - Station wagon, a designation of some manufacturers
 - Olof Swartz, botanist, abbreviated Sw. in botanical citations
 - Band 3, a protein
 - Unified Soil Classification System symbol for well graded sand
 
Other uses
- Sw., taxonomic author abbreviation for Olof Swartz (1760–1818), Swedish botanist and taxonomist
 - Swahili language (ISO 639 alpha-2 code "sw")
 - Star Wars, a science fiction media franchise
 - Suicide watch
 - "S.W", a song by Blonde Redhead from their 2007 album 23
 - Shadow Warrior, a series of computer games
 - Social work
 
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