General Sir John Kotelawala Defence University Library (KDUL) is the main student support services the University offer for the learning and advancement of knowledge of the KDU community.

The library supports students to achieve their learning goals and to make them learned professionals with higher graduate profiles. The library supports University to achieve its mission by providing dynamic and proactive information services. KDUL network is to provide a variety of resources in multiple formats which to enhance teaching, learning and research activities of the University.

The KDU Library network consists of the Main Library, Southern Campus Library, and two faculty libraries; the Library of Faculty of Medicine and the Faculty of Allied Health sciences. It caters to over 6000 members, including both students and staff.