Former Owner
- Nathaniel Castleton Stephen Poyntz1
- Nathaniel G. Snelling1
- Nettie Goldsmith Naumburg1
- Neustift Abbey1
- Neuwerk Nunnery1
- Niccolò Albergati1
- Nicholas Bacon1
- Nicolas Antoine Labbey de Billy1
- Octave Chavaillor1
- Orlandus de Fatiis1
- Otto Ege1
- Otto Vollbehr1
- P. Desq1
- P. Pigeot1
- Paolo Guerrini1
- Paolo Vimercati Sozzi1
- Paul III1
- Paul Joseph Sachs1
- Paul Viollet1
- Pazzi family1