DZ
DZ, Dz, or dz may refer to:

Businesses and organizations
Delftsche Zwervers, a Dutch student society and rover crew
Delta Zeta, a college sorority in the USA
Discovery Zone, an American children's entertainment business from 1989 to 2001 and currently since 2020.
Donghai Airlines, the IATA code for this airline.

In language
Dz (digraph), used in Polish, Kashubian, Macedonian, Slovak, Esperanto, Hungarian, Dene Suline (Chipewyan) and Cantonese Pinyin
Dzongkha (ISO 639 alpha-2 code)
Voiced alveolar sibilant affricate [d͡z] or [d͜z], as in the English word "adze"

People
John Drewienkiewicz, British soldier
Dolph Ziggler, American professional wrestler

In science and technology
dz, in calculus, notation for the differential of a variable z
DZ, METAR code for drizzle

Other uses
Algeria (ISO 3166-1 country code)
.dz, Algeria's internet country code top-level domain (ccTLD)
DZ-manga, comic books originally published in Algeria that draw inspiration from Japanese manga
Demilitarized zone, a buffer zone between military powers
Dragonball Z, a TV series
Drop zone, as in a parachuting drop zone
contraction for dozen