Buis is a Dutch surname that may refer to Dale R. Buis (1921–1959), U.S. Army Major killed in Vietnam Dyan Buis (born 1990), South African Paralympic sprinter and long jumper Greg Buis, American reality show contestant Jan Buis (born 1933), Dutch cyclist Leen Buis (1906–1986), Dutch cyclist Lela E. Buis, American speculative fiction writer, playwright, poet and artist Marjolein Buis (born 1988), Dutch wheelchair tennis player Tom Buis, former president of the American National Farmers Union
BUIS may also refer to Backup iron sights, a type of firearm sights