Conn may refer to:
- Conn (name), a family name and a masculine given name
- Conn (nautical), the duty of giving directions for movement from the deck of a ship to the helm
- Conn of the Hundred Battles, a figure from Irish mythology
- C.G. Conn, Inc., a manufacturer of musical instruments
- Conn-Selmer, Inc., a manufacturer and distributor of musical instruments
- Conn, Ontario, Canada
- Lough Conn, a lake in County Mayo, Connacht, Ireland
- Connecticut, United States
- Connecticut College, a liberal arts college in New London, Connecticut, USA
- Connection string