Title
- On Jews living in Rome1
- On accounting and commissions1
- On mnemonics and memory1
- Opuscula1
- Opusculum de formandis epistolis1
- Or ha-sekhel and Sefer ha-Shem1
- Oratio ad immortalitatem illustriassimae nec non famigerratissimae laudis1
- Orations4
- Ordinances6
- Ordinary of arms1
- Ordo benedicendi oleum catechumenorum et infirmorum et conficiendi chrisma1
- Ordo dedicationis ecclesiae et altaris1
- Ordo exsequiarum1
- Ordo missae1
- Painting1
- Paludi pontine1
- Pandnāmah1
- Panegyric2
- Papal brief3
- Papal bull20