With approximately 90,000 printed titles and approximately 900,000 electronic licensed copies, the IEG library offers literature on the history of Europe since the mid-15th century.

The focus is on European and international history as well as church and theological history since the Humanist and Reformation periods. The library provides international monographs, specialist journals, and bibliographic resources on these topics. All holdings can be searched in the Institute's online catalog.

The library's reference collection is used by the institute's employees, scholarship holders, and guests, and is also available to anyone outside the institute who wishes to read, work, or conduct research in the library.