William Cavendish, Adipati IV Devonshire

William Cavendish, Adipati IV Devonshire, KG, PC (1720 - 2 Oktober 1764) adalah negarawan Whig Britania yang merupakan Perdana Menteri Britania Raya selama jabatan yang singkat.

Gelar 

 Lord Cavendish of Hardwick (1720-1729)
 Marquess of Hartington (1729-1741)
 Marquess of Hartington, MP (1741-1751)
 The Rt. Hon. Marquess of Hartington (1751-1755)
 His Grace The Duke of Devonshire, PC (1755-1756)
 His Grace The Duke of Devonshire, KG, PC (1756-1764)

Cavendish