BZ or similar may stand for:
- BZ, the Romanian car number plate for Buzau
- BZ, the German car number plate for Bautzen
- South Tyrol or Province of Bolzano, BZ being the car-license plate abbreviation of this Italian province
- B'z, a Japanese musical group
- B.Z featuring Joanne, an early stage name for pop singer Joanne Accom
- Several German-language newspapers:
- Badische Zeitung, Freiburg
- Braunschweiger Zeitung, Braunschweig
- B.Z., Berlin
- Berliner Zeitung, also Berlin
- Berner Zeitung, Bern
- Byzantinische Zeitschrift, German academic journal
- Belize, ISO 3166-1 2-letter country code
- .bz is the ccTLD for Belize
- Brazil, World Meteorological Organization country code
- Battlezone
- Several chemical terms:
- Belousov-Zhabotinsky reaction
- 3-quinuclidinyl benzilate, an odourless military incapacitating agent with NATO code BZ
- benzimidazole, an aromatic compound and parasiticide
- benzodiazepines
- benzoyl group (Bz), C6H5-CO-, a functional group: acyl derived from benzoic acid
- Blue Dart Aviation, IATA airline code
- Bravo Zulu a naval signal, meaning 'well done'
- Brent crude oil futures trading symbol on the NYMEX commodities exchange
- busy in Internet slang (from the American pronunciation "bee-zee")
- bzip2, an algorithm for data compression
- Keystone Air Service IATA airline code
- Beyond Zork
- Border Zone
- Bugzilla
- Buitenzorg, Batavia Java
- BZ, the Danish term for the squatting movement