Cornish is a surname. Notable people with the surname include:
Abbie Cornish (born 1982), Australian actress
Albert J. Cornish (1856–1920), Justice of the Nebraska Supreme Court
Audie Cornish (born 1979), American journalist
Charles John Cornish (1858–1906), English naturalist and author
Cyril Cornish (1891–1961), Australian politician
D. M. Cornish (born 1972), Australian fantasy author
Francis Evans Cornish (1831–1878), Canadian politician
Fred Cornish (1876–1940), Wales international rugby player
Gene Cornish (born 1944), American musician (The Young Rascals)
Harry Cornish (1871–1918), English cricketer
Hugh Cornish (1934–2024), Australian television personality
James Cornish (1792–1865), British politician
Jane Antonia Cornish, English composer
Jessie J (born 1988) (real name Jessica Cornish), English R&B and Soul recording artist
Joe Cornish (born 1968), British television personality
Joe Cornish (photographer) (born 1958), British landscape photographer
John Cornish (1837–1918), Inaugural Anglican bishop of St Germans
Jon Cornish (born 1984), Non-Import Canadian Football League player
Kimberley Cornish, Australian writer on Wittgenstein and Hitler
Kirk Cornish, Bahamian politician
Mary Cornish, New Zealand performing arts educator
Mitch Cornish (born 1993), Australian rugby league player
Richard Cornish (born 1942), Australian artist and art theoretician
Richard Cornish (shipmaster) (died 1625), shipmaster accused of forcible sodomy
Robert E. Cornish (1903–1963), controversial American researcher
Samuel Cornish, 1st Baronet (c. 1715 –1750), British naval commander and MP
Samuel Cornish (1795–1858), African-American Presbyterian minister
Sandy Cornish (1793–1869), civic leader in Key West, Florida; former slave
Vaughan Cornish (1862–1948), English geographer.
Virginia Cornish, American chemist
William Cornish (disambiguation), various people