WZ may refer to:
- WZ sex-determination system, also known as the ZW sex-determination system
 - WZ theory, a technique for simplifying certain combinatorial summations in mathematics
 - Eswatini (FIPS 10-4 country code WZ)
 - Westdeutsche Zeitung, a German newspaper
 - Wetzlar, Germany
 - WinZip, a computer file compression software
 - Wizet, a Korean online gaming developer, which uses the file extension .wZ
 - W and Z bosons in particle physics
 
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