Cy, CY, or cy may refer to:
Cystic fibrosis (CF) is a genetic disorder that affects mostly the lungs, but also the pancreas, liver, kidneys, and intestine.
Cybercrime, or computer oriented crime, is crime that involves a computer and a network. The computer may have been used in the commission of a crime, or it may be the target.
Cynthia Ann Stephanie Lauper (born June 22, 1953) is an American singer, songwriter, actress and LGBT rights activist.
Cytochromes P450 (CYPs) are proteins of the superfamily containing heme as a cofactor and, therefore, are hemoproteins.
Cyrus II of Persia (Old Persian: 𐎤𐎢𐎽𐎢𐏁 Kūruš; New Persian: کوروش Kuruš; Hebrew: כורש, Modern Kōréš, Tiberian Kōréš; c.
Cycling, also called bicycling or biking, is the use of bicycles for transport, recreation, exercise or sport.
Cyberpunk is a subgenre of science fiction in a futuristic setting that tends to focus on a "combination of lowlife and high tech" featuring advanced technological and scientific achievements, such as artificial intelligence and cybernetics, juxtaposed with a degree of breakdown or radical change in the social order.