Dovid Katz (Yiddish: הירשע־דוד כ״ץ‎, also הירשע־דוד קאַץ‎, Hirshe-Dovid Kats, [ˌhirʃɛ-ˈdɔvid ˈkɑt͡s], born 9 May 1956) is an American-born, Vilnius-based scholar, author and educator, specializing in Yiddish language and literature, Lithuanian Jewish culture, and the Holocaust in Eastern Europe. In recent years, he has been known for combating the so-called "Double Genocide" revision of Holocaust history which asserts a moral equivalence between Nazi Germany and the Soviet Union. He is editor of the web journal Defending History which he founded in 2009. He is known to spend part of each year at his home in North Wales. His website includes a list of his books, of some articles by topic, a record of recent work, and a more comprehensive bibliography.