Former Owner
- Notre-Dame de Macourt monastery1
- Notre-Dame monastery (Ambert, France)1
- Noël Pinelli1
- Nur al-Din Arslan Shah I1
- Nārāyaṇa Gālane1
- Nīlakaṇṭha Tanūja1
- O. A. Bump1
- Octave Chavaillor1
- Oettingen-Wallerstein library1
- Ohio State University Center for Epigraphical and Palaeographical Studies1
- Ohio State University School of Music1
- Okar, Baganbhaṭṭa1
- Oliver Henry Perkins12
- Oliver R. Barrett4
- Omaha Public Library1
- Oric Bates2
- Orlandus de Fatiis1
- Oswald Carl Friedrich von Seilern und Aspang2
- Otto Ege90
- Otto Haas1