Cavendish is an English surname of Norman origin. Notable people with the surname include:
Ada Cavendish (1839–1895), British actress
Anthony Cavendish (1927–2013), British intelligence officer
Camilla Cavendish (born 1968), British journalist
Lord Charles Cavendish (1704–1783), British nobleman, Whig politician and scientist
Charles Cavendish (1793–1863), British Liberal politician
George Cavendish (writer) (c. 1494 – 1562) English writer and biographer of Cardinal Thomas Wolsey
Henry Cavendish (1731–1810), British physicist, discoverer of hydrogen
Margaret Cavendish, Duchess of Newcastle-upon-Tyne (1623–1673), English aristocrat, writer, and philosopher
Mark Cavendish (born 1985), Manx cyclist
Michael Cavendish (born c. 1565), English composer
Peregrine Cavendish, 12th Duke of Devonshire (born 1944), British Peer and owner of Pratt's Club
Lord Richard Cavendish (1752–1781), British MP
Lord Richard Cavendish (1871–1946), British MP, aristocrat, author, magistrate
Lucy Cavendish (1841–1925), British pioneer of women's education
Richard Cavendish (occult writer) (1930–2016), British writer on topics dealing with the occult
Sid Cavendish (1876–1954), English footballer with Southampton and Clapton Orient
William Cavendish-Bentinck, 3rd Duke of Portland (1738–1809), Prime Minister of the United Kingdom
Thomas Cavendish (1564–1593), English admiral
