O
- Obaku (school of Buddhism)
- Oda Sesso
- Offering (Buddhism)
- Henry Steel Olcott
- Old age
- Ole Nydahl
- Om
- Om mani padme hum
- Once-returner
- Ōryōki
- Outline of Buddhism
Read more about this topic: Index Of Buddhism-related Articles
O
Read more about this topic: Index Of Buddhism-related Articles