Encyclopedias, Almanacs, Transcripts, and Maps
- Nullification Controversy
- Numbers Games
- Nur al-Din Abu Ishaq al-Bitruji
- Nureddin
- Nuremberg Laws
- Nuremberg War Crimes Trials
- Nuri al-Sa'id
- Nurse Corps, Army and Navy
- Nurses
- Nursing in the Caribbean
- Nursing in the United States
- Nyasaland
- Nydia Margarita Velázquez
- Nymphs
- Nzinga Nkuwu
- O Aleijadinho
- O'Brien, Jeremiah
- O'Brien, Murrough
- O'Hair, Madalyn Murray
- O'Hara, Charles