George Lachmann Mosse (September 20, 1918 – January 22, 1999) was an emigre from Nazi Germany first to Great Britain and then to the United States who taught history as a professor at the University of Iowa, the University of Wisconsin-Madison, and the Hebrew University. Best known for his studies of Nazism, he authored more than 25 books on topics as diverse as constitutional history, Protestant theology, and the history of masculinity. In 1966, he and Walter Laqueur founded The Journal of Contemporary History, which they co-edited.
Mosse was born in Berlin to a prominent, well-to-do German Jewish family. His maternal grandfather, Rudolf Mosse, founded what became Germany's largest advertising agency, and his media empire included the respected liberal newspaper Berliner Tageblatt. His father, Hans Lachmann-Mosse, commissioned the architect Erich Mendelsohn to redesign the iconic Mossehaus where the Tageblatt was published. George Mosse was educated at the noted Mommsen-Gymnasium in Berlin and from 1928 onwards at the elite boarding school Salem. In his autobiography, he described himself as a rebellious child. The headmaster at Salem, Kurt Hahn, was an advocate of experiential education and required all pupils to engage in physically challenging outdoor activities. Although Mosse disliked the school's nationalistic ethos, he conceded that its emphasis on character building and leadership gave him "some backbone." He preferred individual sports, such as skiing, to team activities.