Cavendish is an English surname of Norman origin. Notable people with the surname include:
Ada Cavendish (1839–1895), British actressAnthony Cavendish (1927–2013), British intelligence officerCamilla Cavendish (born 1968), British journalistLord Charles Cavendish (1704–1783), British nobleman, Whig politician and scientistCharles Cavendish (1793–1863), British Liberal politicianGeorge Cavendish (writer) (c. 1494 – 1562) English writer and biographer of Cardinal Thomas WolseyHenry Cavendish (1731–1810), British physicist, discoverer of hydrogenMargaret Cavendish, Duchess of Newcastle-upon-Tyne (1623–1673), English aristocrat, writer, and philosopherMark Cavendish (born 1985), Manx cyclistMichael Cavendish (born c. 1565), English composerPeregrine Cavendish, 12th Duke of Devonshire (born 1944), British Peer and owner of Pratt's ClubLord Richard Cavendish (1752–1781), British MPLord Richard Cavendish (1871–1946), British MP, aristocrat, author, magistrateLucy Cavendish (1841–1925), British pioneer of women's educationRichard Cavendish (occult writer) (1930–2016), British writer on topics dealing with the occultSid Cavendish (1876–1954), English footballer with Southampton and Clapton OrientWilliam Cavendish-Bentinck, 3rd Duke of Portland (1738–1809), Prime Minister of the United KingdomThomas Cavendish (1564–1593), English admiral