Underhill is a surname. Notable people with the surname include:
Barbara Underhill (born 1963), Canadian figure skater
Beth Underhill (born 1962), Canadian equestrian
Cave Underhill (1634 – c. 1710), English actor
Evelyn Underhill (1875–1941), British writer
Frank Underhill (1889–1971), Canadian historian and social activist
George Lees Underhill (1813–1881), iron merchant who became thirteenth Mayor of Wolverhampton, 1861/62
Henry Underhill (1914–1993), British politician
Hercules Underhill (died 1650), who confirmed the sale of New Place to William Shakespeare
Hugh Underhill (1518–1593), English keeper of the wardrobe under Queen Elizabeth I
Captain John Underhill (1597–1672), English colonist and soldier in the Massachusetts Bay Colony
John Edward Underhill (1574–1608), English diplomat and exile
Isaac Underhill Willets (1819–1899), a prominent Long Island farm owner
John Q. Underhill (1848–1907), American politician
John R. Underhill (born 1961), British geologist and football referee
Martyn Underhill (born 1958), Detective and Police and Crime Commissioner Dorset
Paco Underhill, American environmental psychologist
Robert L. M. Underhill (1889–1983), American mountaineer
Roy Underhill (born 1950), American woodwright and host of the television series "The Woodwright's Shop"
Steven Underhill (born 1962), American photographer
Wilbur Underhill, Jr. (1901–1934), American criminal, burglar, bank robber and Depression-era outlaw
William Underhill (died 1570), who purchased New Place
Fictional characters:
Ted Underhill, character in the films Fletch (film) and Fletch Lives
Susan Underhill (aka Betty Jo Bialosky), character from The Further Adventures of Nick Danger by Firesign Theater
Underhill (first name not mentioned), an FBI interrogator in John Grisham's novel The Partner
