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 a 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.
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.
Cytochromes P450 (CYPs) are proteins of the superfamily containing heme as a cofactor and, therefore, are hemeproteins.
Cyrus II of Persia (Old Persian: 𐎤𐎢𐎽𐎢𐏁 Kūruš; Kourosh; New Persian: کوروش Kuruš; Hebrew: כורש, Modern: Kōréš, Tiberian: Kōréš; c.
Cynthia Ann Stephanie Lauper (born June 22, 1953) is an American singer, songwriter, actress and activist.
Cycling, also called biking or bicycling, is the use of bicycles for transport, recreation, exercise or sport.