The title of Earl of Cornwall was created several times in the Peerage of England before 1337, when it was superseded by the title Duke of Cornwall, which became attached to heirs-apparent to the throne.

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• Condor of Cornwall, probably legendary Earl of Cornwall before the Conquest, said to have paid homage to William for the Earldom^[1]

• Brian of Brittany (c. 1040–1084 or 85), resigned c. 1072

• Robert, Count of Mortain (c. 1038–1095), half-brother of William the Conqueror
• William, Count of Mortain (1084–1140), peerage forfeit 1106

• Cadoc II (or Candor), son of Cadoc of Cornwall^{[2][better source needed]}

• Alan (died 1146), nephew of Brian, deprived 1141

• Reginald de Dunstanville, Earl of Cornwall (died 1175), illegitimate son of King Henry I of England

• Richard, 1st Earl of Cornwall, King of the Romans (1209–1272), second son of John, King of England
• Edmund, 2nd Earl of Cornwall (1249–1300), son

• Piers Gaveston, Earl of Cornwall (1284–1312)

• John of Eltham, Earl of Cornwall (1316–1336), second son of king Edward II of England and his queen Isabella of France

Wikimedia Commons has media related to Earls of Cornwall.

• Constitutional status of Cornwall
• Antiqua maneria, the original 17 manors belonging to the Earldom of Cornwall
• Duchy of Cornwall
• Kingdom of Cornwall
• List of legendary rulers of Cornwall