Title
- On Jews living in Rome1
- On Questions in Aristotle’s Nicomachean Ethics1
- On being and essence1
- On buying and selling1
- On diphthongs1
- On mnemonics and memory1
- On the Anger of God1
- On the calibration of sundials1
- On the eternity of the world1
- On virtue1
- Operationes Ihesu Christi1
- Opus pacis1
- Opusculum de formandis epistolis1
- Opusculum de multiplici ludo1
- Oratio ad immortalitatem illustriassimae nec non famigerratissimae laudis1
- Oratio in laudem rei publicae venetorum1
- Orationes in Laurentium Vallam1
- Orator ad Brutum1
- Order for peaceable behavior1
- Ordinatio totius officii divini1