• Nemophas tricolor Heller, 1896 driekleurige nemophas
  Nemophas tricolor
  
• Nemoptera bipennis (Illiger, 1812) gaasvlieg
  lacewing
  
• Neofelis nebulosa (Griffith, 1821) nevelpanter
  mainland clouded leopard
  
• Neomys fodiens (Pennant, 1771) waterspitsmuis
  Eurasian water shrew
  
• Neopsephotus bourkii (Gould, 1841) Bourke's parrot
  Bourkes parkiet
  
• Nepenthes lowii Hook. fil. toiletpotbekerplant
  Low's pitcher plant
  
• Neptunea antiqua (Linnaeus, 1758) noordhoren
  red whelk
  
• Nereites cambrensis MacLeay, 1839 sporenfossiel
  ichnofossil
  
• Nestor notabilis Gould, 1856 kea
  kea
  
• Newlandia frondosa Walcott, 1914 cyanobacteriën
  cyanobacteria
  
• Nicrophorus humator (Gleditsch, 1767) zwarte doodgraver
  burying beetle
  
• Nicrophorus vespillo (Linnaeus, 1758) krompootdoodgraver
  vespillo burying beetle
  
• Nicrophorus vespilloides Herbst, 1783 doodgraver
  burying beetle
  
• Nigella damascena L. juffertje-in-'t-groen
  love-in-a-mist
  
• Nothoprocta ornata (Gray, 1867) pisacca-tinamoe
  ornate tinamou
  
• Nothosaurus marchicus Koken, 1893 nothosaurus
  nothosaurus
  
• Nothosaurus winkelhorsti Klein & Albers, 2009 nothosaurus
  nothosaurus
  
• Numenius arquata (Linnaeus, 1758) wulp
  Eurasian curlew
  
• Numenius tenuirostris Vieillot, 1817 dunbekwulp
  slender-billed curlew
  
• Numida meleagris (Linnaeus, 1758) helmparelhoen
  helmeted guineafowl
  
• Nyctalus noctula (Schreber, 1774) rosse vleermuis
  common noctule
  
• Nyctereutes procyonoides (Gray, 1834) wasbeerhond
  raccoon dog
  
• Nycticebus coucang (Boddaert, 1785) grote plompe lori
  Sunda slow loris
  
• Nycticorax nycticorax (Linnaeus, 1758) kwak
  black-crowned night heron
  
• obsidiaan obsidiaan
  obsidian
  
• Oceanodroma leucorhoa (Vieillot, 1818) vaal stormvogeltje
  Leach's storm petrel
  
• Ochotona pusilla (Pallas, 1769) dwergfluithaas
  steppe pika
  
• Odobenus rosmarus (Linnaeus, 1758) walrus
  walrus
  
• Odocoileus virginianus (Zimmermann, 1780) witstaarthert
  white-tailed deer
  
• Odontochile sp. Hawle & Corda, 1847 trilobiet
  trilobite
  
• Oenothera biennis L. middelste teunisbloem
  common evening-primrose
  
• Oiceoptoma thoracicum (Linnaeus, 1758) oranje aaskever
  red-breasted carrion beetle
  
• Okapia johnstoni (P. L. Sclater, 1901) okapi
  okapi
  
• okeniet okeniet
  okenite
  
• oker oker
  ochre
  
• olivijn olivijn
  
• Oncicola spirula (Olfers in Rudolphi, 1819) stekelsnuitworm
  thorny-headed worm
  
• Ondatra zibethicus (Linnaeus, 1766) muskusrat
  muskrat
  
• Oophaga lehmanni (Myers & Daly, 1976) Lehmann's poison frog
  Lehmanns gifkikker
  
• opaal opaal
  opal
  
• Ophiophagus hannah (Cantor, 1836) koningscobra
  king cobra
  
• Opisthocomus hoazin hoatzin
  
• Orchis militaris L. soldaatje
  
• Orcinus orca (Linnaeus, 1758) orka
  killer whale
  
• Oreaster reticulatus (Linnaeus, 1758) red cushion sea star
  
• Oreaster sp.
• Oriolus oriolus (Linnaeus, 1758) wielewaal
  Eurasian golden oriole
  
• Ornithorhynchus anatinus (Shaw, 1799) vogelbekdier
  platypus
  
• Oroxylum indicum (L.) Kurz midnight horror
  
• Orthetrum cancellatum (Linnaeus, 1758) gewone oeverlibel
  black-tailed skimmer