William Cavendish, 3rd Duke of Devonshire
| The Duke of Devonshire | |
|---|---|
| William Cavendish, 3rd Duke of Devonshire | |
| Lord Lieutenant of Ireland | |
| In office 1737–1744 | |
| Monarch | George II | 
| Preceded by | The Duke of Dorset | 
| Succeeded by | The Earl of Chesterfield | 
| Lord Steward | |
| In office 1733–1737 | |
| Monarch | George II | 
| In office 1744–1749 | |
| Monarch | George II | 
| Lord Privy Seal | |
| In office 1731–1733 | |
| Monarch | George II | 
| Succeeded by | The Viscount Lonsdale | 
| Personal details | |
| Born | 26 September 1698 | 
| Died | 5 December 1755 | 
| Nationality | British | 
| Spouse | Catherine Hoskins | 
| Children | 7 (including William Cavendish, 4th Duke of Devonshire, Lord John Cavendish, and Lord Frederick Cavendish) | 
| Parent(s) | William Cavendish, 2nd Duke of Devonshire Rachel Russell | 
William Cavendish, 3rd Duke of Devonshire, KG, PC (26 September 1698 – 5 December 1755) was a British nobleman and Whig politician who sat in the House of Commons from 1721 to 1729 when he inherited the Dukedom.