The title of Earl of Cornwall was created several times in the Peerage of Cornwall before 1337, when it was superseded by the title Duke of Cornwall, which became attached to heirs-apparent to the throne.

Earls of Cornwall, 1st creation (1068)

• Robert, Comte de Mortain (1031-1095)
• William Fitz-Robert, 2nd Earl of Cornwall (1084-1140), peerage forfeit 1106

Earls of Cornwall, 2nd creation (1140)

• Alain de Bretagne, 1st Earl of Cornwall (d.1146), deprived 1141

Earls of Cornwall, 3rd creation (1141)

• Reginald de Dunstanville, 1st Earl of Cornwall (d.1175)

Earls of Cornwall, 4th creation (1180)

• Baldwin, 1st Earl of Cornwall (d.1188)

Earls of Cornwall, 5th creation (1189)

• John, Earl of Cornwall and Gloucester (1167-1216), peerage merged in the crown 1199

Earls of Cornwall, 6th creation (1217)

• Henry Fitz-Count, 1st Earl of Cornwall (1175-1222), resigned peerage 1220

Earls of Cornwall, 7th creation (1225)

• Richard, 1st Earl of Cornwall, King of the Romans (1209-1272)
• Edmund, 2nd Earl of Cornwall (1250-1300)

Earls of Cornwall, 8th creation (1307)

• Piers Gaveston, 1st Earl of Cornwall (1284-1312)

Earls of Cornwall, 9th creation (1330)

• John of Eltham, Earl of Cornwall (1316-1336)