Marian Library/International Marian Research Institute

The Marian Library was founded in 1943 at the University of Dayton to provide resources for the promotion of a sound theological foundation for all forms of Marian devotion. It is now one of the world’s premier Marian information and research centers. Books on specifically Marian topics number over 65,000 with another 35,000 titles of general theological works intended to enhance and develop the Marian section.

As a specialized research library, the Marian Library holds many rare and irreplaceable items; for this reason, some of its printed and most of its non-print materials are ordinarily non-circulating. All materials requested will be provided for use in the Reading Room and may be kept there on reserve. Most books and some audio-visual materials are available through the University’s borrowing system, Interlibrary Loan, or by special arrangement.

In 1975, evolving out of previous educational outreach efforts of the Marian Library, the International Marian Research Institute (IMRI) was founded. Affiliated with the Marianum (Rome), IMRI offers advanced (pontifical) academic degrees in theology, with specialization in Marian studies.


The book holdings of the Marian Library can be found in the University of Dayton’s online catalog. In the catalog, Marian Library holding are designated as located either in the Reading Room or the Stacks. The Marian Library Reading Room is open to all students, faculty, and visitors Monday to Friday, 8:30 a.m. to 4:30 p.m.  Materials designated as located in the Stacks must be requested; they may be used in the Reading Room.  Photocopying is available.

Except for rare or irreplaceable items, many items from the Marian Library are available for local circulation to those with U.D. borrowing privileges. The decision concerning which materials are available for circulation is made by the librarian at the Marian Library


Interlibrary Loan

Except for rare and irreplaceable items, materials in the Marian Library are available for circulation through Interlibrary Loan to university libraries. Interlibrary Loan materials from the Marian Library are mailed UPS with a declared insurance value, with the request that they be returned UPS.

In case of fragile and rare materials, the Marian Library may indicate that the loan will be made only if the receiving library agrees to a “library-to-library” arrangement, that is, the material may not be removed from that library. The Marian Library may also offer to scan or photocopy relevant pages of rare documents.