Cy, CY, or cy may refer to:
Cybercrime, or computer-oriented crime, is crime that involves a computer. The computer may have been used in the commission of a crime, or it may be the target.
Cyanobacteria , also known as Cyanophyta, are a phylum of bacteria that obtain their energy through photosynthesis, and are the only photosynthetic prokaryotes able to produce oxygen.
Cystic fibrosis (CF) is a genetic disorder that affects mostly the lungs, but also the pancreas, liver, kidneys, and intestine.
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.
Cytochromes P450 (CYPs) are proteins of the superfamily containing heme as a cofactor and, therefore, are hemoproteins.
The Cyrillic script is a writing system used for various alphabets across Eurasia, particularly in Eastern Europe, the Caucasus, Central Asia, and North Asia.