Sir Spencer Walpole (February 6, 1830 - July 7, 1907) was an English historian and civil servant.
He came of the younger branch of the family of the famous Whig prime minister, Robert Walpole, being descended from his brother, the 1st Lord Walpole of Wolterton. He was the son of the latter's great-grandson, the Right Hon. Spencer Horatio Walpole (1807-1898), three times home secretary under Edward Geoffrey Smith Stanley, 14th Earl of Derby, and through his mother was grandson of Spencer Perceval, the Tory prime minister who was murdered in the House of Commons.
Spencer Walpole was educated at Eton, and from 1858 to 1867 was a clerk in the War Office, then becoming an inspector of fisheries. In 1882 he was made lieutenant-governor of the Isle of Man, and from 1893 to 1899 he was secretary to the Post Office. In 1898 he was knighted.
Although well known as a most efficient public servant, and in private life as a well-liked man, Walpole is chiefly remembered as an historian. His family connexions gave him a natural bent to the study of public affairs, and their mingling of Whig and Tory in politics contributed, no doubt, to that quality of judicious balance--inclining, however, to the Whig or moderate Liberal side--which, together with his sanity and accuracy, is so characteristic of his writings. His principal work, the History of England from 1815 (1878-1886), in six volumes, was carried down to 1858, and was continued in his History of Twenty-Five Years (1904).
Among his other publications come his lives of Spencer Perceval (1894) and Lord John Russell (1889), and a volume of valuable Studies in Biography (1906).