George Harcourt Vanden-Bampde-Johnstone, 3rd Baron Derwent

George Harcourt Vanden-Bampde-Johnstone, 3rd Baron Derwent FRSA (22 October 1899 – 13 January 1949), was a British author, diplomat and Liberal politician.

Early life Derwent—always known to his family and friends as "Peter" —was born in London on 22 October 1899. He was the son of Hon. Edward Henry Vanden-Bempde-Johnstone, and Hon. Evelyn Mary Agar-Ellis.

Derwent was educated at Sandroyd School, followed by Charterhouse. Many of his contemporaries at the latter school believed Derwent to be attracted to men, and while singing in the school choir he met the future poet and novelist Robert Graves. Derwent and Graves struck up a close friendship which appears to have been romantic—Graves later said their relationship was "proto-homosexual" but denied that they were ever involved sexually, instead describing their romance as "chaste and sentimental".

After Charterhouse, Derwent went up to Merton College, Oxford where he won the Newdigate Prize in 1920. He succeeded as the third Baron Derwent on the death of his uncle in 1929. "Asked by the British Who's Who to list his recreations, he put down, 'Fishing, golf, and thinking the twentieth century is just wonderful.'" However, Lord Derwent died before the marriage took place. Upon his death in Paris on 13 January 1949, aged 49, on his way back from a health visit to Switzerland, he was succeeded by his younger brother Patrick as they had no children.