William Cavendish, 3rd Duke of Devonshire (26 September 1698 - 5 December 1755) married Catherine Hoskins (or Hoskyn) (died 8 May 1777). He served as Lord Privy Seal from 1731 to 1733.

|- style="text-align: center;" | width="30%" |Preceded by:
In Commission | width="40%" style="text-align: center;" |Lord Privy Seal
1731–1733 | width="30%" |Succeeded by:
The Viscount Lonsdale

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The Earl of Chesterfield | width="40%" style="text-align: center;" |Lord Steward
1733–1737 | width="30%" |Succeeded by:
The Duke of Dorset

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The Duke of Dorset | width="40%" style="text-align: center;" |Lord Lieutenant of Ireland
1737–1744 | width="30%" |Succeeded by:
The Earl of Chesterfield

|- style="text-align: center;" | width="30%" |Preceded by:
The Duke of Dorset | width="40%" style="text-align: center;" |Lord Steward
1744–1749 | width="30%" |Succeeded by:
The Duke of Marlborough