Thrax or Thraex (Latin borrowing of Ancient Greek Θρᾷξ "Thracian") may be

• Historical figures:
  • Dionysius Thrax (c. 170-90 BC), a Hellenistic grammarian
  • Maximinus Thrax (c. 173–238), Roman emperor from Moesia
  • Leo I Eastern Roman emperor
  • Justin I Eastern Roman emperor
• Thrax (mythology), a child of Ares
• Thrax, neosapien character in "Exosquad"
• Thrax, a virus and the main antagonist in Osmosis Jones
• Thrax, a villain from the 15th anniversary episodes of Power Rangers
• Thrax, the City of Windowless Rooms from Gene Wolfe's The Book of the New Sun series.
• Anthrax

• Thraex, a type of gladiator.

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