Underhill may refer to:
Places Underhill, a community within the rural community of Miramichi River Valley, Canada Underhill (ward), Barnet, London Underhill, Dorset, England Underhill Stadium, Barnet, England, the former home ground of Barnet F.C. Underhill, Vermont, United States Underhill, Wisconsin, United States Underhill (community), Wisconsin. an unincorporated community, United States Underhill, Gateshead, Tyne and Wear, first house in the world to be lit by Electric light Underhill, Wolverhampton, a housing estate in North-east Wolverhampton also known as the Scotlands Estate.
Fiction Underhill, the name of the first settlement on Mars in the novel Red Mars by Kim Stanley Robinson Underhill, fictional character in the short story The Rule of Names by Ursula K. Le Guin Underhill, an alternate reality inhabited by any multitude of fantasy creatures in Mercedes Lackey's urban fantasy novels Sherkaner Underhill, fictional non-human character in the novel A Deepness in the Sky by Vernor Vinge Underhill, Ted, fictional character in the movie Fletch Underhill, Mr., the name Gandalf gave Frodo Baggins to travel under when he left Hobbiton in The Fellowship of the Ring by J.R.R. Tolkien
Other Underhill (surname), notable people named Underhill , a ship of the U.S. Navy