The Theological Branch Library comprises a collection of about 320,000 volumes and 200 current periodicals. The collection focus is on main and subcategories of theology (Old Testament, New Testament, church history, systematic theology, practical theology, mission science, ecumenical studies, Christian Coptic Studies, Christian archeology and art, studies on the Eastern Churches). It also includes Judaism, comparative religion studies and neighboring fields of theology necessary for research, teaching and study such as ancient oriental studies, classical and ancient studies, philosophy and sociology.
The library emerged from the Theological College library of the Kirchliche Hochschule Berlin/West and the library of the Theological Faculty at the Humboldt University in 1993. The collection contains modern research publications as well as historical coverage.