Cy, CY, or cy may refer to:
Cyprus, officially the Republic of Cyprus, is an island country in the Eastern Mediterranean and the third largest and third most populous island in the Mediterranean.
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: כֹּרֶשׁ, Modern Kōréš, Tiberian Kōréš; c.
Cycling, also called bicycling or biking, is the use of bicycles for transport, recreation, exercise or sport.
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.