Castell is a surname. Notable people with the surname include:
Alan Castell (born 1943), English cricketer
David Castell, American record producer, musician and recording engineer
Dominic Castell (born 1965), Austrian film actor
Edmund Castell (1606–1685), English orientalist
John Castell (aka John Castle), 15th-century Master of University College, Oxford and a Chancellor of the University
Lacksley Castell (1962–1984), Jamaican reggae singer
Patricia Castell (1926–2013), Argentine actress
Sir William Castell (born 1947), British businessman
