- O caminho budista
- O Coração da Bondade
- O Evangelho de Buda
- O Renascimento de Buda
- O Senhor da Dança
- O Voto Bodhisattva
- O yoga que conduz à plenitude
- Object Relations, Buddhism, and Relationality in Womanist Practical Theology
- Obras completas
- Ocean of Diversity
- Ocean of Milk, Ocean of Blood
- Ocean of Reasoning
- Océano de néctar
- Odyssey to Freedom
- Oeuvres complètes
- Oeuvres de Léon Feer
- Of Time and the Timeless
- Ofrenda al Guía Espiritual
- Ofrenda de fuego del mandala corporal de Heruka
- Okinawa: A People and Their Gods
- Oltre l’ombra
- Ombre sotto il letto
- On Becoming and Stopping
- On Calm Abiding Resting The Mind In Meditation
- On Generating the Resolve to Become a Buddha
- On Love
- On Meditation
- On Understanding Japanese Religion
- On Zen Practice
- Once a Peacock, Once an Actress
- One Arrow, One Life
- One Hundred Days of Solitude
- Oni, histoires de démons japonais
- Open Mind
- Open to Desire
- Opening a Mountain
- Opening the Hand of Thought
- Oraciones de larga vida para el venerable Gueshe Kelsang Gyatso Rimpoché
- Opening the Hand of Thought
- Oraciones de larga vida para el venerable Gueshe Kelsang Gyatso Rimpoché
- Oraciones para meditar
- Oraciones sinceras
- Oración del Buda de la Medicina
- Oracle of Vajrapani
- Original Innocence
- Original Nature
- Origins of Moral-Political Philosophy in Early China
- Ornament of Abhidharma
- Ornament of Precious Liberation
- Ornament of Stainless Light
- Orthodoxy
- Os Ensinamentos de Siddartha Gautama, O Buda
- Os Verdadeiros Oito Corretos Caminhos
- Other Lives
- Our Human Potential
- Our life in the Lotus Sutra