William Capell, 3rd Earl of Essex, was born 1698 to Algernon Capell, 2nd Earl of Essex (1670-1710) and Mary Bentinck (c1679-1726) and died 8 January 1743 of unspecified causes. He married Jane Hyde (c1699-1724) 27 November 1718 . He married Elizabeth Russell (bef1711-1784) 3 February 1726 .
|Offspring of William Capell, 3rd Earl of Essex and Jane Hyde (c1699-1724)|
|Charlotte Capell (1721-1790)||2 October 1721||3 September 1790 Stony Stratford, Buckinghamshire, England, United Kingdom||Thomas Villiers, 1st Earl of Clarendon (1709-1786)|
|Mary Capell (1722-1782)||13 October 1722||April 1782||John Forbes (1714-1796)|
|Offspring of William Capell, 3rd Earl of Essex and Elizabeth Russell (bef1711-1784)|
|William George Capell (1728-1728)|
|William Anne Capell, 4th Earl of Essex (1732-1799)||7 October 1732 Turin, Piedmont, Italy||5 March 1799 St James Palace, Westminster, Middlesex, England, United Kingdom||Frances Hanbury-Williams (1735-1759) Frances Hanbury-Williams (1735-1759) Harriet Bladen (-1821)|