Encyclopaedia Judaica: An authoritative, multimedia work that covers Jewish history, culture, religion, and practices; entries are downloadable. A print set is available at Hayden Library's Scholar Enclave Collection.
Cambridge Histories: Several reference works, including Cambridge Encyclopedia of Judaism, Cambridge History of Jewish Philosophy, and relevant articles in other titles.
Jewish Encyclopedia (1906): A historical work from the early 20th century that has not been updated.
YIVO Encyclopedia of Jews in Eastern Europe: A definitive work about the civilization of Eastern European Jewry; includes primary source materials such as documents, images, audio and video, and maps. A print edition is available here.
Encyclopedia of Jews in the Islamic World. Norman A. Stillman; editors, Phillip I. Ackerman-Lieberman ... [et al.]. Leiden; Boston: Brill, 2010.
Jewish Women Archive: An online database produced by the Jewish Women's Archive.
Encyclopedia of Jewish Folklore and Traditions: Beliefs and practices, holidays, artifacts, Jewish ethnographies, country surveys.
Encyclopedia of the Bible and its Reception (EBR): Cultural history of the Hebrew Bible.
Encyclopedia of the Dead Sea Scrolls (Oxford Press): History and meaning of Dead Sea scrolls (Eds. Lawrence Schiffman & James VanderKam).
Fifty Key Jewish Thinkers: Cohn-Sherbok, Dan. Routledge, 2013.
Encyclopedia of Hebrew Language and Linguistics: Khan, Geoffrey, and Shmuel Bolozky. 2013. Leiden.
For reference resourced for Holocaust studies, see the Holocaust Studies library guide.