ZK may refer to: ZK (framework), an AJAX/XUL Web Application Framework ZK (rapper), Danish rapper and singer Great Lakes Airlines (IATA airline designator ZK) Zentralkomitee, the executive body of the Socialist Unity Party of Germany Zero-knowledge, a cryptographic proof concept Zero-K, an open source RTS computer game Zettakelvin, an SI unit of temperature the alleged publisher of Sad Satan