The Leo Dehon Library houses a comprehensive theological and scriptural collection of over 100,000 volumes in a light, inviting space. The collection has special strengths in the areas of church history, social justice, Mozarabic liturgy, and canon law, and is enhanced by extensive holdings in philosophy, psychology, and the arts. The library is also a major repository of materials on devotion to, and theology and spirituality of, the Sacred Heart, as well as resources on the Priests of the Sacred Heart and Dehonian spirituality. The book collection is further enhanced by over 300 periodical subscriptions and relevant research aids. It also maintains a substantial collection of audiovisual materials in various formats.
The library is a full member of the Southeastern Wisconsin Information Technology Exchange (SWITCH) consortium which operates the online catalog and provides access to seven other private academic libraries in the area.
In addition to its primary mission of supporting the Priestly Formation and Master of Arts programs at Sacred Heart, the library serves the academic, pastoral and personal needs of registered patrons from the wider community.