Title
- Office of the Mother of God1
- Office of the Virgin1
- Officii et magistrati1
- Officium dicendum in ecclesiola supra illos, qui damnati sunt ad mortem1
- Ogasawara-den saiku kata kikigaki1
- Oleum effusum nomine tuum1
- Omnes ad praeda venient1
- Omnium gentium mores, leges, et ritus1
- On Catholic faith1
- On Jews living in Rome1
- On Questions in Aristotle’s Nicomachean Ethics1
- On accounting and commissions1
- On being and essence1
- On buying and selling1
- On charms and talismans1
- On diphthongs1
- On mnemonics and memory1
- On perfection and penance1
- On the Anger of God1
- On the calibration of sundials1