Hans Hermann Julius Hager was a German writer on pharmacy.

Hermann Haken is physicist and professor emeritus in theoretical physics at the University of Stuttgart. He is known as the founder of synergetics and one of the "fathers" of quantum-mechanical laser theory. He is a cousin of the mathematician Wolfgang Haken, who proved the Four color theorem. He is a nephew of Werner Haken, a doctoral student of Max Planck.

Hermann Heinrich Gossen was a Prussian economist who is often regarded as the first to elaborate, in detail, a general theory of marginal utility.

Hermann Karl Hesse was a German-Swiss poet, novelist, and painter. His best-known works include Demian, Steppenwolf, Siddhartha, and The Glass Bead Game, each of which explores an individual's search for authenticity, self-knowledge and spirituality. In 1946, he received the Nobel Prize in Literature.

Hermann Jellinek (22 January 1822 in Drslavice – 23 November 1848 in Vienna) was a writer, journalist, and revolutionary from a prominent Austrian Jewish family. His older brother Adolf Jellinek was one of Austria-Hungary's leading rabbis and writers.

Hermann Kant was a German writer noted for his writings during the time of East Germany. He won the Heinrich Mann Prize in 1967. He served the Stasi as an informer under the codename IM Martin.

Hermann Robert Richard Eugen Kasack was a German writer. He is best known for his novel Die Stadt hinter dem Strom. Kasack was a pioneer of using the medium broadcast for literature. He published radio plays also under the pen names Hermann Wilhelm and Hermann Merten.

Hermann Kesten was a German novelist and dramatist. He was one of the principal literary figures of the New Objectivity movement in 1920s Germany.

Hermann Kinder was a German writer.

Hermann Kletke was a German poet, novelist, and journalist.