Karl Behrens (* 18 November 1909 in Kreuzberg, Berlin; † 13 May 1943 in Plötzensee Prison) was a design engineer and resistance fighter against Nazism. Behrens was most notable for being was a member of the Berlin-based anti-fascist resistance group, that was later called the Red Orchestra by the Abwehr. Behrens acted as a courier for the group, passing reports between Arvid Harnack and Hans Coppi who was the radioman. Behrens was also active is a resistance group at the AEG turbine factory power together with and others.