Gathorne-Hardy is a surname of English origin. The first part is pronounced with a long 'a', i.e. as if "gaythorn". People with that surname include:
Alfred Gathorne-Hardy (1845–1918), British Member of Parliament
Edward Gathorne-Hardy (1901–78), British Bohemian socialite
Gathorne Gathorne-Hardy, 1st Earl of Cranbrook (1814–1906), British politician
Geoffrey Malcolm Gathorne-Hardy (1878–1972), British soldier, writer and Norse specialist
Lady Isobel Gathorne-Hardy (born Isobel Stanley, 1875–1963), Britishwoman, daughter of the Lord Stanley who founded the Stanley Cup for ice hockey, and one of the first women to play that game
John Francis Gathorne-Hardy (1874–1949), British general
John Gathorne-Hardy, 2nd Earl of Cranbrook (1839–1911), known as Lord Medway 1892–1906, British peer and Member of Parliament
Jonathan Gathorne-Hardy (born 1933), British biographer
Robert Gathorne-Hardy (1902–73), British garden and fiction writer
