ZK may refer to:
Arts and entertainment
- ZK (rapper), Danish rapper and singer
- Zero-K, a 2010 real-time strategy game
- ZK, alleged publisher of Sad Satan
- ZK, Australian duo comprising Zaachariaha Fielding and Kristal West in 2014
Aviation
- Great Lakes Airlines (IATA designator: ZK)
- ZK, the aircraft registration prefix for New Zealand
Politics
- Zentralkomitee, Socialist Unity Party of Germany's executive body
Science and technology
- Zero knowledge (disambiguation), various concepts in cryptographic proof
- Zettakelvin, an SI unit of temperature
- ZK (framework), an AJAX web framework for graphical UIs
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