Cyk or CYK may refer to:
Cykranosh is the fictional name for the planet Saturn in the Cthulhu Mythos. Cykranosh is the creation of Clark Ashton Smith and is part of his Hyperborean cycle.
Cyklokros Plzeň (English: Cyclocross Plzeň) is a cyclo-cross race held annually in Plzeň, the Czech Republic as part of the UCI Cyclo-cross World Cup.
Cyclophosphamide (CP), also known as cytophosphane among other, is a medication used as chemotherapy and to suppress the immune system.
Zyklon B (German pronunciation: [tsykloːn ˈbeː]; anglicized. US pronunciation: /ˈzaɪklɒn ˈbiː/ or translated Cyclone B) was the trade name of a cyanide-based pesticide invented in Germany in the early 1920s.
Tranexamic acid (TXA) is a medication used to treat or prevent excessive blood loss from major trauma, post partum bleeding, surgery, tooth removal, nose bleeds, and heavy menstruation.
Cyklon was a German make of car produced from 1902 to 1931. It was primarily noted for its unique three-wheeled design.
A Connecticut Yankee in King Arthur's Court is an 1889 novel by American humorist and writer Mark Twain.