Title
- Octoechos1
- Office of the Dead1
- Ogasawara-den saiku kata kikigaki1
- Omnium gentium mores, leges, et ritus1
- On Jews living in Rome1
- On accounting and commissions1
- On the martrydom of Ḥusayn1
- Opuscula1
- Or ha-sekhel and Sefer ha-Shem1
- Oratio ad immortalitatem illustriassimae nec non famigerratissimae laudis1
- Orationes1
- Orations1
- Ordinary of arms1
- Ordo benedicendi oleum catechumenorum et infirmorum et conficiendi chrisma1
- Ordo exsequiarum1
- Orthographia1
- Ottoman letters1
- Padārthakhaṇḍanavyākhyā tīkā1
- Palm leaf manuscript1
- Panegyric1