Klaus Schmitt (born 1940 in Rimbach/Odenwald, Germany) is an American mathematician doing research in nonlinear differential equations, and nonlinear analysis.
Schmitt completed the Abitur at Rimbach's Martin-Luther-Schule in 1960.
He began his 43-year career at the University of Utah in 1967, first as assistant, then associate, then as full professor of mathematics.
He has served as professor emeritus of mathematics at the University of Utah since 2010.
Schmitt was awarded the Humboldt Prize in mathematics in 1978 and was honored as a University of Nebraska Distinguished Alumnus in 2000.