The collections and services of Key School libraries support the School's Mission. Committed to the principles of intellectual freedom, all three libraries maintain rich resources that acquaint students with diverse cultures, experiences and ideas. Good literature and freedom of inquiry are core values of Key School and its libraries. The collections of all three campus libraries are accessible through the School's online catalog.

The warm and welcoming Manse Library serves the First School and the Lower School. A vibrant library program teaches students to become both effective researchers and discriminating readers. An 8,000-plus-volume collection includes books and materials that enchant and inform two through ten-year-olds.

The Ford K. Brown Library, named for a former tutor at St. John's College who was involved in the founding of Key School, serves the academic and recreational needs of the Middle School community. Materials in print, on-line, and audio-visual collections have been carefully selected to support curricular objectives, to promote literacy, and to stimulate the imagination.

The Upper School Library provides diverse spaces for activities that reflect the range of intellectual and social pursuits of the Key School community. A fireplace, a glass-enclosed reading porch, and individual study carrels invite both collaborative work and quiet reflection, yet the space is easily transformed for town meetings, coffee houses and poetry readings. The Upper School Library is truly the heart of the Upper School, a space that nourishes the growth of the School community.