- Nibykot
- Nicassar
- Nidian
- Nidya
- Nietzschean
- Night-Gaunt
- Night Mare
- Night Scorp
- Night Stalker
- Nightmare
- Nightmare (Destiny)
- Nightmare (Freespace)
- Nightmare (Metroid)
- Nightsider
- Nightwatcher Worm
- Nightwing and Flamebird
- Nihilanth
- Nikto
- Nilian
- Nimbanel
- Nimbuloid
- Nimbus' species
- Nimbus III Dancer's Species
- Nimon
- Nimp
- Nimrog
- Nin'aenh
- Ninety-Niner
- Ning and Skun's species
- Nintendian
- Niordi
- Niori
- Nippalian
- Niris
- Nish
- Nitrium Parasite
- Nivlac
- Nivopantamian
- Nix-Hound
- Nixor
- Nobargan
- Noble
- Noctax
- Nod
- Nodulian
- Noehon
- Noghri
- Nohrin
- Noise (Symphogear)
- Noisemaze
- Nokkian
- Noktoren
- Nolos
- Nomad
- Nomai
- Nometian
- Nommo
- Noolan
- Noolian
- Noophian
- Noorf-og-inki
- Noorian
- Noosphere
- Nopal's species
- Nor Tullivo
- Norblock Five's Species
- Norcadian
- Norcan
- Norcoochian Flying Pig
- Nord (Star Wars)
- Norkanian
- Norky's species
- Normal Ghoul (Lapamauve) (Devast.io)
- Nornep
- Norns
- Norrin Radd
- Norshk
- Nos Monster
- Nosaurian
- Nose-Sucker
- Nosedeenian
- Nosoron
- Nostnavay
- Nosy (Lilo & Stitch)
- Nothing Face
- Nothoiin
- Noti
- Nourasian
- Nova
- Nova Cat
- Novarian
- Novian
- Novus
- Nox
- Noxalite
- Noyd
- Nrak
- Nucleogenic Lifeform
- Nude Person
- Nudj
- Nuhvok
- Nui-Rama
- Nuiwit
- Nukie's Species
- Nuknog
- Nulian
- Null
- Null Guardian
- Nullan
- Numlock
- Numlox and Phlegmak
- Nummonan
- Nuna
- Nungiirtok
- Nurgling
- Nurloc
- Nutsy
- Ny'ghan Grii
- Nyarlathotep
- Nyemarian
- Nymenian
- Nymethny
- Nymph (Knights of the Zodiac)
- Nymph (Nagarya)
- Nympus
- Nyork
- Nyororo
- Nyptonian
- Nyriaanan
- Nyrond
- Nyxian
- O'reenian
- Oaken King
- Oan
- Obblinox
- Obdurate
- Oberonian
- Obi-Wan Kenobi
- Oblati
- Observer
- Observer (Brewster Rockit)
- Observer (Rick and Morty)
- Observer (The Nitrogen Fix)
- Obsidian Beetle
- Obsidius
- Oc'to
- Ocampa
- Occulan
- Occuli
- Ocean of Solaris
- Ockoran
- Octabrain
- Octalian
- Octanian
- Octo-Squatch
- Octoboo
- Octobot
- Octogore
- Octoguy
- Octolings
- Octoomba
- Octopus
- Octowhale
- Octroll
- Oculognathus
- Oculon
- Oculus
- Oculus (Kogama)
- Oddbods
- Odenji
- Oderus Urungus
- Odonto people
- Oenrallian
- Officiun
- Ogami
- Ogdru Hem
- Ogdru Jahad
- Ogemite
- Oggdo Bogdo
- Oghaldzon
- Ogigi
- Oglaroonian
- Ogliarchon
- Ogmalan
- Ogre (Face Off)
- Ogre (Masters of the Universe)
- Ogri
- Ogrim
- Ogron
- Ogron Predator
- Ogrum
- Ogrut
- Ogryn
- Ogumo
- Oh-Mook
- Ohb
- Ohne
- Okar
- Okky
- Oku
- Okudum
- Ol'hornk
- Old God
- Old One (DC)
- Old One (Palladium)
- Old One (Warhammer 40,000)
- Oldbot
- Oleant
- Olive's Species
- Olkari
- Ollie
- Ollopom
- Olyix
- Omatranian
- Omec
- Omega Sentinel
- Omegan
- Omelite
- Omera
- Omhara
- Omicronian
- Omnibot
- Omnicon
- Omnivoracious
- Omnogrom
- Omorr
- Omwaan
- Omwati
- On-fire Pterodactyl
- Onahk
- Onashi's Species
- Onbaa
- Ondrockan
- One Mind
- Ongachic
- Ongree
- Oni (Kuromukuro)
- Oni (Roswell Conspiracies)
- Oni (Urusei Yatsura)
- Onion (Pikmin)
- Onkifurt
- Ono Mao
- Onodone
- Onogrosh
- Onoogie AKA
- Onos
- Ontabbaren
- Onteen
- Ontinae
- Ood
- Ooggy
- Oogie
- Oolin
- Oolon Colluphid
- Oolovian Lazybeast
- Ooni
- Oorg
- Ootoolan
- Oozeform
- Opabinia
- Opee Sea Killer
- Ophidian
- Ophidian (Cloudburst)
- Ophidian (WarBreeds)
- Oprelian Amoeba
- Optera
- Opticoid
- Optoc
- Oracoan
- Oranean
- Orange Bulborb
- Orange Phazon
- Orangucon
- Oravores
- Orbalisk
- Orbisur
- Orbital Frame
- Orbiton
- Orbulon
- Orc
- Orc (Final Fantasy XI)
- Orc (Serious Sam)
- Orc (The Galactic Navy Officer Becomes an Adventurer)
- Orc (Warcraft)
- Orcus Galacticus
- Ord
- Order of the Steed
- Order of the Twelve
- Ordl
- Oregus Plant
- Orfa
- Orff
- Orfolei
- Orga
- Organian
- Orgaplonian
- Orgemich
- Orgnobi
- Orgon
- Ori
- Orion (Master of Orion)
- Orion (Star Trek)
- Orishan
- Oritta
- Ork
- Ork (Kingmaker)
- Ork (Masters of the Universe)
- Orkan
- Orkan Slime Grub
- Orkunu
- Orlapa
- Orloni
- Orlop
- Orlosh
- Ormazdian
- Ormerowon
- Ornithoid Lifeform
- Orocoran
- Orokoid
- Oroog
- Orooturooan
- Oros Gec
- Orovar
- Orpheus Grub
- Orray
- Orryxian
- Orsian
- Orthellin
- Orthgot
- Orthopterran
- Ortog
- Ortolan
- Ortonix
- Oruc
- Oryctini
- Orz
- Oscarmayerian
- Osirian
- Osirian (Doctor Who)
- Osirian (Futurama)
- Osirian (Viagens Interplanetarias)
- Osmosian
- Osmotic Eel
- Osnullus
- Ossan
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