| Naology |
Study of church or temple architecture |
| Nasology |
Study of the nose |
| Nautics |
Art of navigation |
| Nematology |
The study of nematodes |
| Neonatology |
Study of newborn babies |
| Neossology |
Study of nestling birds |
| Nephology |
Study of clouds |
| Nephrology |
Study of the kidneys |
| Neurobiology |
Study of anatomy of the nervous system |
| Neurology |
Study of nervous system |
| Neuropsychology |
Study of relation between brain and behaviour |
| Neurypnology |
Study of hypnotism |
| Neutrosophy |
Study of the origin and nature of philosophical neutralities |
| Nidology |
Study of nests |
| Nomology |
The science of the laws; especially of the mind |
| Noology |
Science of the intellect |
| Nosology |
Study of diseases |
| Nostology |
Study of senility |
| Notaphily |
Collecting of bank-notes and cheques |
| Numerology |
Study of numbers |
| Numismatics |
Study of coins |
| Nymphology |
Study of nymphs |