Title
- Nūr al-wahhāj fī al-kalām ʻalá al-isrāʼ wa-al-miʻrāj1
- Observationes1
- Observations upon the rise and progress of the late rebellion against King Charles the First1
- Occasional services1
- Occult texts1
- Octoechos1
- Office2
- Office of the Dead1
- Ogasawara-den saiku kata kikigaki1
- Omnis mortalium cura2
- Omnium gentium mores, leges, et ritus1
- On Jews living in Rome1
- On accounting and commissions1
- On the martrydom of Ḥusayn1
- Ontology text1
- Opuscula1
- Or ha-sekhel and Sefer ha-Shem1
- Oratio ad immortalitatem illustriassimae nec non famigerratissimae laudis1
- Orationes1
- Orations1