Cornubia can be:

• Cornubia, the ancient Latin name for either:
  • Cornouaille, a historic region in Brittany, northwestern France
  • Cornwall, a region in southwestern England
• Cornubia, a geologists' name for the Cornubian batholith, the granite massif of Devon and Cornwall in England
• Cornubia, Queensland, a southern suburb of Brisbane, Queensland, Australia
• Cornubia City, a new development in Durban, South Africa
• SS Cornubia (ship)
• Cornubia (mite), a genus of mites

• Union Mill Complex
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