kw or KW may refer to:
- Kuwait, ISO 3166-1 country code
- .kw, the country code top level domain (ccTLD) for Kuwait
- KW postcode area, Kirkwall, Orkney
- Kilowatt
- Self-ionization of water Kw
- Cornish language's ISO 639 code
- Kitchener–Waterloo, Ontario, Canada
- Kripke's Wittgenstein in Kripkenstein
- Kwangwoon University
- Kenworth trucks