Hermann August Hagen

Hermann August Hagen
Born	30 May 1817 (1817-05-30) Königsberg, Prussia
Died	9 November 1893 (1893-11-10) (aged 76) Cambridge, Massachusetts, United States
Citizenship	German
Education	University of Königsberg
Known for	Monographie des Termites, Synopsis of the Neuroptera of North America
Parent(s)	Anna (Linck) Hagen and Carl Heinrich Hagen
Scientific career
Fields	Medicine and Entomology
Institutions	Harvard University
Notable students	John Henry Comstock, Albert J. Cook, Herbert Osborn, Henry G. Hubbard, Charles W. Woodworth
Author abbrev. (zoology)	Hagen

Hermann August Hagen (30 May 1817 – 9 November 1893) was a German entomologist who specialised in Neuroptera and Odonata. He had established himself as one of Europe's preeminent entomologists by 1867 when he accepted a position at Harvard University to curate the Museum of Comparative Zoology. In 1870 he became the first entomologist in the United States to hold the formal title, Professor of Entomology.