0K (zero K) or 0-K may refer to:
Zero killed (used by bombers during World War II) Temperature zero Kelvin, or Absolute zero Zero knowledge in cryptology: Zero-knowledge proof Non-interactive zero-knowledge proof Zero-knowledge password proof Zero keel, a type of Suspension keel Zero-K, an open source real time strategy game Zero K (novel), a novel by Don DeLillo
See also
OK (disambiguation) K0 (disambiguation)