The Ibn Khaldun Library of The Graduate School of Islamic and Social Sciences provides students and faculty with a rich resource of over 35,000 volumes focused primarily around Islamic studies, but supplemented with collections in comparative religion and the social sciences. The reference collection includes electronically-stored collections of Fiqh, Usul al-Fiqh, Hadith, Islamic History, Quran, Tafsir and of the Encyclopedia of Islam, as well as biographies, and encyclopedias.

The Ibn Khaldun Library uses the Library of Congress system of cataloging, and has the capacity to conduct searches for volumes in English and in Arabic transliteration using the Library of Congress Arabic Romanization Table. The Ibn Khaldun Library is designed for research use at the graduate and post-graduate level. Library patrons visiting the Ibn Khaldun can use BookWhere, which will search 567 library databases to locate a book in North America. Computers are available with internet access for student use as well as computer workstations that have the Arabic version of Microsoft Word. The Ibn Khaldun library staff is available to assist students. In addition to its collection of over 35,000 volumes, students and faculty have access to the libraries of the ten seminaries that are members of The Washington Theological Consortium, which collectively hold over one million volumes in the area of theology and related disciplines.