- 1 Natural aging
- 4 Natural gas
- 2 Natural history museums (buildings)
- 1 Natural history specimens
- 93 Natural landscapes
- 1 Nature prints
- 6 Nature reserves
- 1 Naughton and Weimar Machine Shop
- 1 Naval equality
- 16 Naval hospitals
- 4 Naval Limitation Treaty
- 5 Naval operations
- 2 Naval schools (buildings)
- 7 Naval schools (institutions)
- 19 Naval ships
- 21 Naval warfare
- 20 Naval yards & naval stations
- 5 Navies
- 4 Navigation charts
- 3 Navigational instruments
- 5 Navy (Philadelphia, Pa. : Monument)
- 1 Neal, J. Iron Works
- 1 neatsfoot oil
- 1 Neave, Benjamin
- 2 Nebuchadnezzar II, King of Babylonia, d. 562 B.C.
- 1 Necessity
- 3 Necklaces
- 1 Necrosis
- 1 Nedro Avenue
- 2 Needles
- 6 Needlework
- 1 Neele, Henry
- 1 Negatherum Cavreri
- 1 Negative campaigning
- 1 Nehemiah (Governor of Judah)
- 4 Neighborhoods
- 1 Neill, John, 1819-1880
- 1 Nelson, Horatio Nelson, Viscount, 1758-1805
- 1 Nelson's Hotel
- 16 Neoclassical
