Former Owner
- Notre-Dame monastery (Ambert, France)1
- Novalesa Abbey1
- Noël Pinelli1
- Nur al-Din Arslan Shah I1
- Nūr al-Dīn Darvīsh1
- Ochsenhausen Abbey1
- Oliver Henry Perkins4
- Oliver R. Barrett1
- Omaha Public Library1
- Oric Bates2
- Orlandus de Fatiis1
- Oswald Carl Friedrich von Seilern und Aspang2
- Otto Ege3
- Otto Schäfer1
- Otto Vollbehr2
- Otto Walter Fuhrmann1
- Owen D. Young1
- P. Desq1
- Pangracius Chrewczer1
- Paolino Gianfilippi1