Fenster is a surname, from the German language word for "window". Notable persons with this surname include:
Della Dumbaugh, formerly Della Fenster, American historian of mathematics Aaron Fenster, Canadian engineer Ariel Fenster (born 1943), Canadian science promoter and lecturer at McGill University Boris Fenster (1916–1960), Russian dancer, choreographer and ballet master Darren Fenster (born 1978), American baseball player and coach Fred Fenster (born 1934), American metalsmith Gigi Fenster, South African-born New Zealand author, creative writing teacher and law lecturer Julie M. Fenster (born 1957), American author of historical articles and books Mark Fenster, American lawyer and author in Florida Saul Fenster, president of New Jersey Institute of Technology during 1978–2002 Karol Martesko-Fenster, American media executive Leon Fenster, British artist
Fictional characters Arch Fenster, a character in the American 1962–63 sitcom I'm Dickens, He's Fenster Fred Fenster, a character in the 1995 film The Usual Suspects
Other uses Fenster (band), a German band Fenster, another name for a tectonic window (a geologic structure) Fenster School, American school in Catalina Foothills, Arizona Schnell Fenster, Australian band, active 1986–1992 "Tausend Fenster", Austrian entry in the Eurovision Song Contest 1968