William Capell may refer to:
- William Capel (d.1515), Lord Mayor of London
- William Capell, 3rd Earl of Essex (1697 - 1743), 3rd Earl of Essex
- William Capell, 4th Earl of Essex (1732 - 1799), 4th Earl of Essex
- William Capel (cricketer) (1775 - 1854), Sportsman and priest
- William Jennings Capell (b.1953), US Citizen, current heir presumptive to the earldom of Essex
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