The library at OTI presently has over 19000 books and adds 500 books every year. It has a strong base in mission studies, besides ample resources in Biblical Studies, Theology, History, Counselling and Religion. About 50 national and international scholarly Journals are subscribed every year and held as back issues. The library also provides access to electronic journals available on the web. The library is computerized using ChazLib Software and the library catalogue is available online (OPAC- Online Public Access Catalogue). OTI library provides internet-enabled computer lab facility for students on a ratio of 4:1. 

OTI is a member of Global Digital Theological Library which provides access to 300,000+ books, 15,000,000+ articles and 11,000+ articles. OTI library is also a member of ITLA, a professional association of theological librarians and libraries in India.