Fritz Müller (1821–1897) was a German biologist active in Brazil.
Fritz Müller may also refer to:
Fritz Müller (doctor) (1834–1895), Swiss doctor, zoologist, and herpetologist Fritz Mueller (1907–2001), German engineer Fritz Müller (glaciologist) (1926–1980), Swiss, gave name to Muller Ice Shelf Fritz Müller (pilot), former German Luftwaffe flying ace Fritz Müller (politician) (1920-2001) Fritz Müller (racing driver) (born 1941), German former racing driver in 1993 24 Hours of Le Mans Fritz Müller (rugby union), German rugby union player Fritz Müller (typographer)