Gerhard Friedrich Ernst Flesch (8 October 1909 – 28 February 1948) was a German SS functionary during the Nazi era. After World War II, he was tried, found guilty and executed for his crimes, specifically the torture and murder of members of the Norwegian resistance movement.

Friedrich Ernst Gerhard Flesch, född 8 oktober 1909 i Posen, död 28 februari 1948 i Trondheim, var en tysk krigsförbrytare. Han var Gestapo-chef i Tröndelagen och Obersturmbannführer i SS samt Oberregierungsrat.