Former Owner
- Nathaniel Sherman Bouton1
- Neuman-Walter1
- New York Academy of Medicine7
- Niccolò Albergati1
- Nicholai von Bodeck1
- Nicholas B. Scheetz2
- Nicolai Briganti1
- Nicolas Antoine Labbey de Billy3
- Nicolas Fowle1
- Nicolas Rauch1
- Nicolas Yemeniz1
- Nicolaus Pol1
- Nicolaus de Monte Murro1
- Nonnberg Abbey1
- Norman H. Strouse4
- Northwich Library1
- Octave Chavaillor1
- Oettingen-Wallerstein library1
- Oliver Henry Perkins2
- Oliver R. Barrett1