- An Outline of English Phonetics, Jones, D.
- Obscure Religious Cults, Dasgupta, Shashibhusan
- Ocean of Wisdom: The Life of Dalai Lama XIV, Chopra, P.N.
- Oedipus the King, Sophocles, tr. F. Storr
- Office Yoga: Tackling Tension with Simple Stretches you can do at Your Desk,Friedeberger, Julie
- On Being Buddha, Griffiths, P.J.
- On Being Mindless-Buddhist Meditation and the Mind Body Problem, Griffiths, P. J
- On Knowing Reality, Willis, Janice Dean
- On Understanding Buddhist: Essays on the Theravada Tradition in Sri Lanka, Carter, John R.
- On Voidness: A Study on Buddhist Nihilism, Tola, Fernando and Carmen Dragonetti
- On Yuan Chwang’s Travels in India, Watter, Thomas (ed.)
- Openness Mind, Tulku, Tarthang
- Organizational Rules: A Framework for Understanding Organizational Action, Milss, Albert J. and Stephen J. Murgatroyd
- The Origin of the Buddha Image, Coomaraswamy, Ananda K.
- Origin and Evolution of Religion, Hopkins, E. Washburn
- The Origin of Our Knowledge of Right and Wrong, tr. Chisholm, Roderick M.
- On the Origin of Species, Darwin, Charles
- Other Times: Philosophical Perspectives on Past, Present and Future, Cockburn, David
- The Origins Of Superstitions And Customs, Knowlson, T. Sharper
- Outline on Mahayana Buddhism, Suzuki, Daisetz Teitaro
- Outline of Buddhism: A Historical Sketch, Rhys Davids, C.A.F.
- Outline of Indian Philosophy, Hiriyanna, M.
- Outlines of Psychology, Wundt, Wilhelm Max, tr. Charles Hubbard Judd
- The Oxford Book of Essays, Gross, John.
- An Outline of the Religious Literature of India, Farquhar, J.N
Thư viện Tịnh thất Hiệp Giác