Title
- Octoechos1
- Office of the Dead1
- Omnium gentium mores, leges, et ritus1
- On Jews living in Rome1
- On accounting and commissions1
- Ontology text1
- Oratio ad immortalitatem illustriassimae nec non famigerratissimae laudis1
- Orations1
- Ordinances1
- Ordo benedicendi oleum catechumenorum et infirmorum et conficiendi chrisma1
- Ordo missae1
- Orthographia1
- Padārthakhaṇḍanavyākhyā tīkā1
- Papal agreement1
- Paramāmṛta1
- Pasquillus in aulicos1
- Pattern-book1
- Pavanapāvana1
- Pañcamīpūjāvidhi1
- Pañcapādikāvivaraṇa1