Frederick Lamb, 3rd Viscount Melbourne
| The Viscount Melbourne | |
|---|---|
| 1846 portrait by John Partridge | |
| British Ambassador to Austria | |
| In office 1831–1841 | |
| Preceded by | Sir Henry Wellesley | 
| Succeeded by | Sir Robert Gordon | 
| British Ambassador to Portugal | |
| In office 1827–1831 | |
| Preceded by | Sir William à Court | 
| Succeeded by | Baron Howard de Walden | 
| British Minister to Bavaria | |
| In office 1815–1820 | |
| Preceded by | George Rose | 
| Succeeded by | Brook Taylor | 
| Personal details | |
| Born | Frederick James Lamb 17 April 1782 | 
| Died | 29 January 1853 (aged 70) | 
| Spouse | Countess Alexandrina von Maltzan | 
| Relations | William Lamb, 2nd Viscount Melbourne (brother) Emily Lamb, Countess Cowper (sister) | 
| Parent(s) | Peniston Lamb, 1st Viscount Melbourne Elizabeth Milbanke | 
| Education | Eton College | 
| Alma mater | University of Glasgow Trinity College, Cambridge | 
Frederick James Lamb, 3rd Viscount Melbourne, GCB, PC (17 April 1782 – 29 January 1853), known as The Lord Beauvale from 1839 to 1848, was a British diplomat.