Title
- 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
- Order3
- Ordinances4
- Ordinary of arms1
- Ordinary of the Mass1
- Ordo benedicendi oleum catechumenorum et infirmorum et conficiendi chrisma1