Cyren may refer to:

• Cyren (surname)

• Cyren Burdick (1800–1837), American politician in Michigan

• Cyren (Ninjago), a character in Ninjago

• Cyren, a 1980s American band featuring Jani Lane

• CYREN, a defunct Internet security company

• CYREN (protein)

See also

• Cyrene (disambiguation)

• Siren (disambiguation)