Title
- Oculus sacerdotis1
- Odes2
- Office5
- Office of the Dead9
- Office of the Virgin1
- Offices3
- Old Testament8
- Oleum effusum nomine tuum1
- Omnis mortalium cura1
- On Catholic faith1
- On being and essence1
- On buying and selling1
- On diphthongs1
- On generation and corruption2
- On the eternity of the world1
- On virtue1
- Opera5
- Operationes Ihesu Christi1
- Ophthalmology text1
- Opuscula2