- Nuzhat al-nuẓẓār fī ʻilm al-ghubār (Ibn al-Hāʼim, Aḥmad ibn Muḥammad)1
- Nādir Shāh, Shah of Iran, 1688-17475
- Nīsābūrī, Niẓām al-Dīn al-Ḥasan ibn Muḥammad, -1328 or 1329. Risālah al-Shamsīyah1
- Obstetrics1
- Occasional poems1
- Orden de Santiago1
- Order of the Garter1
- Order of the Golden Fleece1
- Orders of knighthood and chivalry1
- Ordinances, Municipal1
- Orta, Garcia de, active 16th century1
- Ospedale degli Innocenti (Florence, Italy)1
- Ospedale di San Bartolomeo (Florence, Italy)2
- Ovando, Nicolás de, approximately 1460-15111
- Paganelli, Roberto1
- Pain--Religious aspects--Christianity1
- Painted bindings1
- Painting7
- Pakistan--Wazīrābād1
- Panama--Panama1