| Glossary Term starting with N |
| Search SeaLifeBase |
| 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 |