| 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 |