Trinacria may refer to:

• the ancient Name of Sicily
  • Sicily in the classical Greek period, see History of Greek and Hellenistic Sicily
  • Name for the Kingdom of Sicily during the 1300s
  • Name for the emblem of Sicily (the triskeles with the Gorgoneion Medusa), see Triskelion#Sicily
    • A nickname of the modern Flag of Sicily
• Trinacria (bivalve), a genus of bivalves in the family Noetiidae
• Trinacria (diatom), a genus of diatoms
• Trinacria, a noise/death metal band which is a side project for members of Enslaved