Cyk

Cyk or CYK may refer to:
 * CYK algorithm, a grammar-related algorithm
 * Cyk, Greater Poland Voivodeship (west-central Poland)
 * Cyk, Masovian Voivodeship (east-central Poland)
 * Çük, a Tatar holiday
 * CYK, the National Rail station code for Clydebank railway station, West Dunbartonshire, Scotland