Cy, CY, or cy may refer to:
Cyprus (/ˈsaɪprəs/; Greek: Κύπρος IPA: [ˈcipros]; Turkish: Kıbrıs IPA: [ˈkɯbɾɯs]), officially the Republic of Cyprus (Greek: Κυπριακή Δημοκρατία; Turkish: Kıbrıs Cumhuriyeti), 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.
Cyborg 009 (Japanese: サイボーグゼロゼロナイン, Hepburn: Saibōgu Zero-Zero-Nain) is a manga created by Shotaro Ishinomori.
Cybercrime, or computer 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.
CyanogenMod (/saɪ.ˈæn.oʊ.ˌdʒɛn.mɒd/; sigh-AH-no-GEN-mod) (CM) is a discontinued popular open-source operating system for smartphones and tablet computers, based on the Android mobile platform.
Cyrus II of Persia (Old Persian: 𐎤𐎢𐎽𐎢𐏁 Kūruš; New Persian: کوروش Kūrosh; Hebrew: כֹּרֶשׁ Koresh; c. 600 – 530 BC), commonly known as Cyrus the Great and also called Cyrus the Elder by the Greeks, was the founder of the Achaemenid Empire.
Cycling, also called bicycling or biking, is the use of bicycles for transport, recreation, exercise or sport.
Cyberbullying or cyberharassment is a form of bullying or harassment using electronic forms of contact.
In meteorology, a cyclone is a large scale air mass that rotates around a strong center of low atmospheric pressure.