The Lewis University Library serves students, faculty, alumni, staff, and the public as an educational resource, a lending library, a center for research and study, and the site of several special collections. More than 225,000 people visit the library each year. The collection consists of over 145,000 items, 600 periodical titles and 2,500 videotapes.

Students who are enrolled at the University can access materials online. More than 50 periodical databases are available online. Many of these available are full-text.