Tyrrhenia may refer to:

• Tyrrhenia aka Etruria or Tyrsenia, the land of the Etruscans, a pre-Indo-European-speaking people on the Italic peninsula, that was subsumed into the growing Roman Republic.
  • An era of Etruria, see List of Iron Age states
• Tyrrhenian Sea, part of the Mediterranean, between the Italian mainland, Sicily, Corsica, and Sardinia
• SS Tyrrhenia (1920-1940), British oceanliner
• A subgenus of Nebria containing:
  • Nebria apuana
  • Nebria eugeniae
  • Nebria fulviventris
  • Nebria lareyniei
  • Nebria orsinii
  • Nebria reymondi
  • Nebria rubicunda rubicunda
  • Nebria testacea
  • Nebria uluderensis
  • Nebria vanvolxemi

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