Santhom Library is located in Vadavathoor, Kottayam, Kerala, India. It is a part of the Pontifical Oriental Institute of Religious Studies, erected at St. Thomas Apostolic Seminary and is one of the largest libraries in Kerala. The library was founded in 1965 and has a collection of over 100,000 books, including rare manuscripts and periodicals. The library is open to the public and is a popular resource for students, researchers, and scholars.

The library is divided into several sections, including the General Section, the Philosophy Section, and the Theology Section. The General Section has a wide range of books on a variety of subjects, including history, literature, philosophy, and religion. The Philosophy Section has books on a variety of philosophical subjects, including logic, ethics, and metaphysics. The Theology Section has books on a variety of theological subjects, including biblical studies, church history, and systematic theology.