Gunnar Emil von Hertzen (11 March 1893 Halikko - 16 July 1973) was a Finnish Jaeger officer and the planner of the Aunus expedition (1919). He was a physician by profession and served as a physician during the Winter and Continuation Wars, becoming a lieutenant colonel in medical corps. He also took part in Nazi organisations in the 1930s and 1940s.[1][2]