Geiser may refer to:
Carl Friedrich Geiser (1843–1934), Swiss mathematician David Geiser (1947–2020), American artist Fabian Geiser (born 1983), Swiss footballer (i.e. soccer player) Geiser Manufacturing, late 19th-century and early 20th-century American manufacturing company of farm equipment Jeff Geiser (born 1953), American football coach Linda Geiser (born 1935), Swiss movie and television actress
See also Gaiser Geyser