Watson Library supports the college mission by providing individual and collaborative learning spaces, research consulting services, and resource collections for students, faculty, and staff. The library provides an on-site library collection of over 135,000 items including current reference sources, circulating books, media materials, and listening and viewing equipment. The library maintains thousands of subscriptions to magazines and journals as well as major state and national newspapers in print and online formats. Library personnel provide on-site, telephone, and e-mail assistance for selecting, locating, evaluating, and utilizing library materials.

Through membership in OPAL (Ohio Private Academic Libraries) and OhioLINK (the statewide academic library system), the library provides convenient delivery service from a base of 45 million titles, access to numerous periodical, research, and media databases at any time from any Internet connection, and permission to visit and borrow directly from any OhioLINK academic library. Wilmington College Cincinnati students and faculty have access to all electronic materials through OhioLink and OPAL. For hard copy items, such as books, students and faculty can receive items through the library at Cincinnati State or any local academic library.
Watson Library Special Collections include the College Archive, which preserves the history of Wilmington College, and several Quaker Collections, which include research materials representing Quaker history, culture, literature, philosophy, and thought among 7000+ volumes. The Quaker Rare Collection contains the historical records of the Wilmington Yearly Meeting and Ohio Valley Yearly Meeting.