ZW or zw may refer to:
Science ZW sex-determination system, chromosomal in birds and some species of reptile, fish, and insect ZW, heterogametic genetic female designation under this system Zettawatt (), an SI unit of power, 10+21 watts Zeptowatt (), an SI unit of power, 10−21 watts Zwicky Catalogue (abbreviated: ), the "Catalogue of Galaxies and of Clusters of Galaxies"
Groups, organizations Air Wisconsin (IATA airline designator: ), a US airline Zulte-Waregem, Belgian association football club Military Gendarmerie (Poland) (; ), Polish military police
Other uses Zimbabwe (ISO 3166-1 alpha-2 country code ), a country in Africa , the country code top level domain (ccTLD) for Zimbabwe Zimbabwean dollar ()
See also
ZVV WZ (disambiguation) ZWS (disambiguation)