The University Library of UP Diliman encompasses one Main Library and more than 40 College/Unit Libraries. It envisions global information exchange throughout the UP Library System. It is mandated to be the information resource center of excellence in the social sciences, humanities and basic sciences. It strives for full automation, a world-class collection and a staff of thoroughly modern information professionals.
The University Library was officially established by the Board of Regents in 1922, fourteen years after the founding of the University of the Philippines in 1908. The University Library, which was at the same time designated as the Department of Library Science was placed on equal level with other departments of instruction for the services of all colleges of the university.
Between the years 1908 to 1922 University constituents made use of small libraries in the various units and colleges of the university and government libraries in Manila for their research and information needs.
The UP Diliman Library Collections have been developed in aid of teaching, research and extension work in the disciplines designated to Diliman. Topping the list of choice collections in UP Diliman are the Filipiniana Collections, which come in print, non-print and digital forms.