Karl-Otto Stöhr (born 9 May 1942) is a German mathematician working on algebraic geometry. He is a titular researcher at the IMPA.
Stöhr is a titular member of the Brazilian Academy of Sciences and has received Brazil's National Order of Scientific Merit. He is also a member of the European Academy of Sciences.
He obtained his Ph.D. at the University of Bonn in 1967 under the guidance of Wolfgang Krull and Jacques Tits.
Arnaldo Garcia was a student of his.