ZK may refer to:
Arts and entertainment ZK (rapper) (born 2000), Danish musician Zero-K, a 2010 real-time strategy game ZK, alleged publisher of Sad Satan, a 2015 horror game ZK, a 2014 Australian duo comprising Zaachariaha Fielding and Kristal West
Aviation Great Lakes Airlines (IATA designator: ZK) ZK, the aircraft registration prefix for New Zealand
Politics Zentralkomitee, the 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