William Courtenay
William Courtenay may refer to:
- William Courtenay (bishop), archbishop of Canterbury
- William Courtenay, 1st [Earl of Devon]
- Sir William Courtenay (1451–1512)
- Sir William Courtenay (1477–1535), MP for Devon
- Sir William Courtenay (died 1557), de jure 2nd Earl of Devon
- Sir William Courtenay (died 1630), de jure 3rd Earl of Devon
- Sir William Courtenay, 1st Baronet, de jure 5th Earl of Devon
- Sir William Courtenay, 2nd Baronet, de jure 6th Earl of Devon
- William Courtenay, 1st Viscount Courtenay, de jure 7th Earl of Devon
- William Courtenay, 2nd Viscount Courtenay, de jure 8th Earl of Devon
- William Courtenay, 9th Earl of Devon
- William Courtenay, 10th Earl of Devon, British aristocrat and politician
- William Courtenay, 11th Earl of Devon
- John Nichols Thom or William Courtenay, Cornish rebel leader
- William Courtenay (actor), American stage and film actor
- William Courtenay (filmmaker), British film maker
- William Courtenay, in 1455, MP for Somerset
- William Courtenay (MP for Fowey), eldest son of 3rd Earl of Devon, represented Fowey
- William Ashmead Courtenay, mayor of Charleston, South Carolina