German journalist and historian whose early emphasis on social structures in historical development were influential in the rise of sociological history.

After entering the University of Marburg to study theology in 1841, Riehl transferred to the University of Tübingen in 1842 to continue in philosophy. He edited journals at Frankfurt, Karlsruhe, Wiesbaden, and Augsburg from 1845 to 1853, when he began teaching at Munich. He returned to journalism briefly, directing the Neue Münchener Zeitung from 1856 until he took the chair in cultural history at the University of Munich in 1859.

Riehl's best known work is Die Naturgeschichte des deutschen Volkes als Grundlage einer deutschen Socialpolitik, 4 vol. (1851–69; “The Natural History of the German People as a Foundation of German Social Politics”), in which he emphasized geographical factors, social conditions, and German local life and culture. In the third volume, Die Familie (1854; “The Family”), he analyzed the family unit as the basis of all social development. He developed a systematic theory of natural forces and conditions as molding society and culture. He contended that two forces, inertia and movement, are fundamental to society—inertia from the social conservatism of the peasants and movement from the progressive attitudes of urban dwellers. His theories have been criticized for their unprofessional and subjective generalizations, but they were nevertheless crucial to the development of cultural and social history in Germany.

Riehl's other works include Kulturstudien (1873; “Studies of Culture”); Die Deutsche Arbeit (1884; “German Labour”); Kulturhistorische Novellen (1864; “Cultural Historical Novellas”); Geschichten aus alter Zeit (1863–65; “Tales of Olden Times”); and several novels.