Cy, CY, or cy may refer to:
Cyprus ( (listen); Greek: Κύπρος [ˈcipros]; Turkish: Kıbrıs [ˈkɯbɾɯs]), officially the Republic of Cyprus (Greek: Κυπριακή Δημοκρατία, lit.
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.
Cyclops (Scott Summers) is a fictional superhero appearing in American comic books published by Marvel Comics and is a founding member of the X-Men.
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.
The Cyrillic script () is a writing system used for various alphabets across Eurasia and is used as the national script in various Slavic-, Turkic- and Persian-speaking countries in Eastern Europe, the Caucasus, Central Asia, and North Asia.
Cyrus II of Persia (Old Persian: 𐎤𐎢𐎽𐎢𐏁 Kūruš; Kourosh; New Persian: کوروش Kuruš; Hebrew: כורש, Modern: Kōréš, Tiberian: Kōréš; c.
Cytochromes P450 (CYPs) are family of enzymes containing heme as a cofactor that function as monooxygenases.