| nadiral |
| NAFO |
| naked |
| Naked-back knifefishes |
| Namaribushi |
| name |
| name-bearing type |
| nanoplankton |
| nape |
| nape fillet |
| naping |
| narial |
| naris |
| Naruto |
| Narutomaki |
| nasal aperture |
| nasal canal |
| nasal capsule |
| nasal curtain |
| nasal flap |
| nasal fossa |
| nasal lamella |
| nasal lobe |
| nasal organs |
| nasal tentacle |
| nasals |
| nasoral grooves |
| natal |
| natal stream |
| natant |
| natio |
| National cure |
| National Institute for Polar Research |
| National Marine Fisheries Service La Jolla Laboratory, California |
| National Museum of Ireland, Dublin |
| National Museum of Marine Biology/Aquarium, Pingtung, Taiwan |
| National Museum of Natural History, Smithsonian Institution, Washington, D.C. |
| National Museum of New Zealand, Wellington |
| National Museum of Victoria |
| National Museums of Scotland |
| National Natuurhistorisch Museum, Leiden |
| National Science Museum, Tokyo |
| National Sun Yat-Sen University |
| National Taiwan University Museum, Taipei |
| native |
| native species |
| native stock |
| Natural cure |
| Natural History Museum an Institute, Port Louis, Mauritius |
| Natural History Museum and Institute, Chiba, Japan |
| natural key |
| natural mortality |
| natural selection |
| naturalised |
| Naturhistorisches Museum der Bürgergemeinde Bern, Bern, Switzerland |
| Naturhistorisches Museum, Wien |
| Naturhistoriska Museum, Göteborg, Sweden |
| nauplius |
| nautical mile |
| navigation |
| neap tide |
| near surface |
| Nearctic |
| nearshore bottom area |
| nearshore waters |
| necrophagy |
| necropsy |
| Needlefishes |
| nehrung |
| nei |
| nekton |
| Nematoda |
| nematodes |
| neo- |
| neoplasia |
| Neoselachii |
| neoteny |
| Neotropical |
| neotype |
| nephros |
| Nerisei-hin |
| Neriseihin |
| neritic |
| neritopelagic |
| nest |
| net drum |
| net hauler |
| net pen |
| net primary production |
| network |
| neural arch |
| neural canal |
| neural crest |
| neural process |
| neural spine |
| neurocranium |
| neurotoxin |
| neuston |
| neustonic |
| neutral buoyancy |
| new combination |
| new replacement name |
| new scientific name |
| New York State Museum, Biological Survey Laboratory, New York |
| New Zealand smelts |
| newts |
| Nga-pi |
| Niboshi |
| niche |
| niche overlap |
| nictitating eyelid |
| nictitating membrane |
| nidification |
| nipping |
| nipple |
| nitrogen fixation |
| nitrogen supersaturation |
| no deep pass atoll |
| no take zone |
| no-take reserves |
| NOAA, National Marine Fisheries Service |
| nobbing |
| nocioceptor |
| nocturnal |
| nomen dubium |
| nomen novum |
| nomen nudum |
| nomen oblitum |
| nomenclator |
| nomenclatorial |
| nomenclatural |
| nomenclature |
| nomenclature act |
| nominal catch |
| nominal species |
| nominal taxon |
| nominotypical taxon |
| non-annual breeder |
| Non-Governmental Organization |
| non-target species |
| noncoral reef coast |
| nonextant |
| Norh Sea |
| Nori |
| normalization |
| North American freshwater catfishes |
| North Atlantic Ocean |
| North Pacific Ocean |
| Northeast Louisiana University, Louisiana |
| Northern Territory Museum of Arts & Sciences, Darwin |
| Northwestern Passages, The |
| Norwegian cured herring |
| Norwegian silver herring |
| Norwegian sloe |
| Norweigian Sea |
| nosing |
| nostril |
| notal |
| notch |
| notched fin |
| Noto Marine Center |
| notochord |
| notochord length |
| nuchal |
| nuchal hump |
| nuchal thorn |
| nuclear family |
| nuclear fission |
| nuclear organizing region |
| nucleolus |
| nucleus |
| nudge |
| numericlature |
| Nuoc-Mam |
| nuptial |
| nuptial tubercle |
| Nurse sharks |
| nursery |
| Nurseryfishes |
| nutrient upwelling |
| nutrients |
| nutrititional gill disease |
| nycthemeral |
| nyctipelagic |
| nyctoepipelagic |
| nystagmus |
