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
This disambiguation page lists articles associated with the title Cyk.
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