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