Hardcastle may refer to:
*a family, the members of which are principal characters in Oliver Goldsmith's play ''She Stoops to Conquer''
*Bill Hardcastle (1874–1944), New Zealand rugby player
*Diana Hardcastle, British actress
*Douglas Hardcastle (1886–1915), English footballer
*Edgar Hardcastle (1900–1995), theorist of Marxist economics
*Edward Hardcastle (1826–1905), British businessman and Conservative politician
*Frances Hardcastle (1866–1941), English mathematician
*Frank Hardcastle (1844–1908), British industrialist and Conservative politician
*Joseph Hardcastle (disambiguation), several people
*Leslie Hardcastle (born 1926), controller of the British Film Institute
*Michael Hardcastle (born 1933), British author of children's sports fiction
*Paul Hardcastle (born 1957), composer
*Rick Hardcastle (born 1956), Texas politician
*Sally Hardcastle (1945–2014), British journalist and radio presenter
*Sarah Hardcastle (born 1969), English swimmer
*Sexton Hardcastle (born 1973), pro wrestler; ring-name for Adam Copeland.
*Sonya Hardcastle (born 1972), New Zealand netballer
*William Hardcastle (broadcaster) (1918–1975), British journalist and radio news presenter
*Hardcastle and McCormick, a 1980s television series
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English-language surnames
Surnames of English origin