Fischbach is a German-origin surname. Notable people with the surname include:
Adolf Fischbach (1920–1972), Oberleutnant in the Luftwaffe during World War II Ayelet Fishbach, professor of Behavioral Science and Marketing at the University of Chicago Claudia Fischbach, German biophysicist Dan Fishbach, American theatre director/producer Flora Fischbach (born 1991), French singer, songwriter Friedrich Fischbach (1839–1908), German textile designer Gerald Fischbach (born 1938), American neuroscientist Greg Fischbach, founder of video game publisher Acclaim Entertainment Johann Fischbach, (1797–1871), Austrian painter Johannes Fischbach (born 1988), German mountain biker Marc Fischbach (born 1946), Luxembourg politician Mark Fischbach (born 1989), American YouTuber known as "Markiplier" Marcel Fischbach (1914–1980), Luxembourg politician, journalist, and diplomat
Michael Fischbach (born 1980), American chemist, microbiologist, and geneticist Michelle Fischbach (born 1965), Minnesota politician Oskar Georg Fischbach (1880–1967), German lawyer Peter Fishbach (born 1947), American tennis player Stephen Fishbach (born 1979), People Magazine blogger and Survivor contestant