Harnack is the surname of a German family of intellectuals, artists, mathematicians, scientists, theologians and those in other fields. Several family members were executed by the Nazis during the last years of the Third Reich. Theodosius Harnack (1817–1889), German theologian Anna Harnack (1849–?) Adolf von Harnack (1851–1930), German liberal theologian and historian of religion Agnes von Zahn-Harnack (1884–1950), German writer and women's rights activist Ernst von Harnack (1888–1945), German anti-Nazi resistance fighter Gustav-Adolf von Harnack (1917-2010), German pediatrician Elisabet von Harnack (1892–1976), German social worker Axel von Harnack (1895–1974), German historian and philologist Carl Gustav Axel Harnack (1851–1888), German mathematician Erich Harnack, professor of pharmacology Otto Harnack, literature historian Clara Harnack, painter and wife of Otto Arvid Harnack (1901–1942), German anti-Nazi resistance fighter Mildred Harnack (1902–1943), American anti-Nazi resistance fighter, wife of Arvid Falk Harnack (1913–1991), German anti-Nazi resistance fighter, film and stage director, brother of Arvid Harnack Other uses Harnack's principle Surnames