ASW, a three-letter abbreviation, may refer to:
- High-temperature insulation wool#alumino silicate wool
- Anti-submarine warfare
- Artificial seawater
- Aswan International Airport, Egypt, IATA code
- All Star Wrestling, a professional wrestling promotion based in Liverpool, England
- All-Star Wrestling, a former professional wrestling promotion based in Vancouver, Canada
- aSmallWorld, an online social network service
- American School of Warsaw, Poland.
- American Spring Wire, a steel manufacturing company based in Bedford Heights, Ohio
- Amalgamated Society of Woodworkers, former UK trades union
- African ancestry in southwestern USA, a populations of the International HapMap Project.
- Arc System Works, a video game development company
- Actual silver weight, a numismatic term referring to silver content of coins
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