Cortana may refer to:

• Cortana (gastropod), a gastropod genus
• Cortana (Halo), character in the Halo franchise
• Cortana (virtual assistant), virtual assistant from Microsoft
• Cortana, or Curtana, a ceremonial sword used in the coronation of British monarchs
• Cortain, or Curtana, the sword wielded by Ogier the Dane, Paladin of Charlemagne