As one of the largest repositories of primary sources relating to twentieth and twenty-first century European and Russian history, the Hoover Institution Archives has numerous documents concerning Jewish individuals and organizations dispersed throughout its collections. In recent years, in line with other academic institutions, the archives has come to recognize the importance of Judaica, or materials relating specifically to Jews and Judaism, and to consider Jewish culture and history as a major field of research and curatorial interest. Although Hoover has no formal Judaica collection as such, certain collections comprise, either in part or in their entirety, a virtual collection of Judaica-related materials. Some highlights of these materials are presented here in the hope that they will be of interest to scholars and other interested researchers in the field of modern Jewish history.