Genealogy Guide: Rabbinical Genealogy

The Chabad Library holds information about many rabbis and a database of Chassidic rabbis (searchable on-site only). chabadlibrary.org

American Jewish Archives (Reform)
Catalog search via americanjewisharchives.org/collections by keyword “rabbi*” and subset “Biographies” provides more than 100 collections, arranged alphabetically by title, including biographical data on Reform rabbis and the holdings of the Hebrew Union College. Located in Cincinnati, Ohio. Open to the public via an application for research form.

Jewish Theological Seminary (Conservative) 
Catalog search via jtsa.edu/library by search term “rabbi* AND biography” plus keywords. Main website: jtsa.edu. Located in Uptown Manhattan. Borrowing of books is permitted to library members, students, staff, and alumni. Membership is available at a fee.

Yeshiva University (Orthodox)
Catalog search via library.yu.edu/home by search term “rabbi*” plus keywords. Located in the Washington Heights neighborhood of Manhattan. Borrowing permitted to YU faculty, students, and staff.

Additional search portals:
Archive Grid - beta.worldcat.org/archivegrid
An online index of archival holdings across national and international repositories: suggested search access point -
beta.worldcat.org/archivegrid/?p=1&q=rabbi*