Reinhardt Kiehl (born 31 May 1935 in Herne, North Rhine-Westphalia)[1] is a German mathematician.
He received in 1965 his Ph.D. (promotion) under Friedrich Karl Schmidt at Heidelberg University with thesis Äquivalenzrelationen in analytischen Räumen.
His research deals with algebraic and arithmetic geometry and non-archimedean function theory.
He wrote a textbook on the Weil conjectures and étale cohomology with Eberhard Freitag.
In 1970 Kiehl was an Invited Speaker at the ICM in Nice, France with Hans Grauert, Kohärenzsätze für stetige und differenzierbare Familien komplexer Räume.