Karl Hermann Martell (November 17, 1906 in Tilsit – December 28, 1966 in Hamburg) was a German actor.
In the 1930s, he reached main billing in romance and adventure films and acted as a partner of Zarah Leander in four movies.
During World War II he participated in Alarm, Ohm Krüger, Back Then and Das alte Lied.
After the Second World War, in the 1950s, Martell tried to resume his movie career, but he was given mainly B-movie roles.
In his last film, The Blue Moth (1959), he again appeared with Zarah Leander, albeit in a minor role.