Robert Walpole (3 May 1736 – 19 April 1810), from 1756 styled The Hon.
Robert Walpole, was the fourth son of the 1st Baron Walpole, who was the younger brother of Prime Minister Robert Walpole, and his wife, Mary Magdalen Lombard.
After serving as secretary of the British embassy in Paris, he was envoy extraordinary and minister plenipotentiary to Portugal from 1771 to 1800.
One of his sons was Major-General George Walpole (1758–1835), under-secretary for foreign affairs in 1806.
He had issue by both wives; Robert Walpole the classical scholar was a son of the first marriage.