Ernst Wilhelm Julius Bornemann (April 12, 1915 – June 4, 1995) was a German crime writer, filmmaker, anthropologist, ethnomusicologist, jazz musician, jazz critic, psychoanalyst, sexologist, and committed socialist. All these diverse interests, he claimed, had a common root in his lifelong insatiable curiosity. From 1982 to 1986 he was president of the German Society for Social-Scientific Sexuality Research. In 1990 he was awarded the Magnus Hirschfeld Medal for sexual science.