- Namoroka
- nasal
- nasal bone
- natatory
- Natural selection
- nearctic
- nectar
- Neo-Darwinism
- neonate
- neoteny
- Neotropics
- Netural theory
- neurocranium
- neutrophil
- niche
- No Assumption
- nocturnal
- Node
- nomenclature
- Non-parametric statistics
- Normal distribution
- nosy
- Nosy Atafana
- Nosy Mangabe
- notch
- notochord
- nucleolus
- nucleus
- Numerical taxonomy