Adolf Ellegard Jensen (January 1, 1899 in Kiel - May 20, 1965 in Mammolshain, Taunus) was one of the most important German ethnologists of the first half of the 20th century. Jensen's main research interests were myth, ritual and cult. He furthered the theory of Cultural Morphology founded by Leo Frobenius. Jensen is mostly known for his research on religious sacrifice that led him to the introduction of the concept of Dema Deity.