Deborah Esther Lipstadt (born March 18, 1947) is an American historian and diplomat, best known as author of the books Denying the Holocaust (1993), History on Trial: My Day in Court with a Holocaust Denier (2005), The Eichmann Trial (2011), and Antisemitism: Here and Now (2019). She served as the United States Special Envoy for Monitoring and Combating Anti-Semitism from 2022 to 2025. Since 1993 she has been the Dorot Professor of Modern Jewish History and Holocaust Studies at Emory University in Atlanta, Georgia, US.