Frederick Lamb, 3rd Viscount Melbourne

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.

Lamb was a younger son of Peniston Lamb, 1st Viscount Melbourne, and his wife Elizabeth Milbanke, and the younger brother of Prime Minister William Lamb, 2nd Viscount Melbourne. Since his mother had numerous lovers, his real paternity is a matter of conjecture. He married Alexandrina Julia Theresa Wilhelmina Sophia Gräfin von Maltzan, daughter of Joachim Charles Leslie Mortimer Graf von Maltzan. It was generally considered to be a love marriage: even though Alexandrina was more than thirty years her husband's junior, he was described as being "as handsome and debonair at sixty as he had been at twenty-five." William, Frederick and their sister Emily remained close all their lives, although Frederick and Emily disliked William's wife Lady Caroline Lamb, whom they called "the little beast".

He served as British Ambassador to Vienna ending in 1841. He was invested as a Knight Grand Cross of the Order of the Bath and admitted to the Privy Council in 1822. In 1839 he was raised to the peerage as Baron Beauvale, of Beauvale in the County of Nottingham. In 1848 he succeeded his elder brother as third Viscount Melbourne.

Despite a certain personal coolness between them, Lord Palmerston, as Foreign Secretary placed great confidence in Lamb, wrote to him in a courteous style very different from his usual brusque manner, and left the running of the Vienna Embassy almost entirely in his hands. The coolness was due to Palmerston's decades-long affair with Lamb's sister Emily, Lady Cowper; Lamb disapproved of the affair and disapproved equally of their eventual marriage, although this proved to be very happy. Palmerston's biographer notes that the marriage coincided with the early stages of the Oriental Crisis of 1840, and that the two men, although they were then personally barely on speaking terms, cooperated in an entirely professional way to resolve it. Palmerston, in addition to his real respect for Lamb, was anxious not to quarrel with him for Emily's sake: as Charles Greville remarked: "the Chief (Palmerston) is devoted to the sister and the sister to the brother". Relations between the two men became friendlier in later years, partly because both Palmerston and Emily were fond of Fred's wife Alexandrina.

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