Georg Herbert Mehlhorn (24 March 1903 – 30 October 1968) was an SS Oberführer,Nazi legal expert, and Gestapo official. Mehlhorn was involved in the camouflage of the mass graves of the Jewish victims in the forest of the Chełmno extermination camp. He operated gas wagons at the Chełmno camp to murder the sick Jewish prisoners who were sent from the Wartheland ghettoes. He was also a director of Stiftung Nordhav, a front organization of the Sicherheitsdienst founded in 1939 by Reinhard Heydrich, one of the main architects of the Holocaust. He was the mentor of SS-Brigadeführer Walter Schellenberg while at the SS-Hauptamt.
Mehlhorn was the son of a wealthy industrialist. He was born in 1903. As a schoolboy, he became a member of nationalist paramilitary organisations. At 16 years of age, he resisted the rules set forward by the Allied Disarmament Commission for Germany, by taking part in exercises involving the camouflage of weapons.
Although too young, at the time, to participate in armed fights between German paramilitaries and Polish fighters over the threatened annexation of Silesia, he still resisted by participating in the underground resistance. Later on, Mehlhorn became an expert on armaments and military policy and used to give lectures in meetings organised by youth sports societies such as Turnerschaft Mundenia. Melhorn has been described as a "strange character".