Ganser is a surname. Notable people with the surname include:
Daniele Ganser (b. 1972), Swiss historian Helen Ganser (1891–1990), American librarian Sigbert Josef Maria Ganser (1853-1931), German psychiatrist Marguerite "Marge" Ganser (1948–1996) and Mary Ann Ganser (1948–1970), members of the girl group The Shangri-Las
See also Ganser syndrome, a rare psychiatric disorder characterised by the individual mimicking behaviour they think is typical of a psychosis