- 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
- Ossie
- Oswaft
- Oswoc
- Ota Rock
- Otarian
- Other (Destiny's Crucible)
- Other (Norby)
- Other Man
- Otoid
- Otolla
- Otrebor
- Otta
- Ottegan
- Oucher-poucher
- Oum
- Oumni
- Outer God
- Outlander
- Outsider
- Outsider (Faster Than Light)
- Outsider (Known Space)
- Outsider (XCOM)
- Overcharge
- Overkreetle
- Overlander
- Overlooker
- Overlord
- Overlord of Barbarus
- Overmonitor
- Overne
- Overseer Bug
- Ovion
- Ovissian
- Ovoid
- Owa
- Owoc
- Owriss
- Owtch
- Oytl
- Ozmodiar
- P'Chek
- P'Kotman
- P'w'eck
- POX
- Pa'lowick
- Pa Tho
- Pacifoid
- Pacithhip
- Packrodent
- Pactyl
- Padas g'roon natives
- Pagoda Tree
- Pagosan
- Pague
- Pagurani
- Pahrak
- Pahvan
- Paigun
- Pailleur
- Pain Elemental
- Pairan
- Pak
- Pak'ma'ra
- Pakiphantos
- Pakled
- Pakmar's Species
- Pakoo
- Pakuni
- Paladrone
- Palarian
- Palliduvan
- Pallorfang
- Palm Müret
- Palukoo
- Palulukan
- Pan-Babylonian
- Pan-Dimensional Being
- Pan-Pan
- Pan-preneur
- Pan (Roswell Conspiracies)
- Pan Galactic Alliance
- Pandasian
- Pandemonium Sprite
- Panderavis
- Pandhe
- Pandimensional Sun Creature
- Pandronian
- Pangaban
- Pangalactic United Forces
- Pannik
- Panspermia
- Panta
- Pantheon of the Black Sun
- Pantophage
- Pantoran
- Pantran Whitefang
- Panuncian
- Paonnid
- Pappy
- Paqwe
- Paracelsus
- Paraceratherium (FMM-UV 32)
- Parachute Worm
- Paradan
- Parademon
- Paragon
- Paramecium
- Paramite
- Parasite (All Tomorrows)
- Parasite (Blake's 7)
- Parasite (Cloverfield)
- Parasite (Cupid's Errant Arrow)
- Parasite (Doom)
- Parasite (Metroid)
- Parasite (Ninjago)
- Parasite (Parasyte)
- Parasite (The Supernaturalist)
- Parasitic Arachnoid (Scavengers Reign)
- Parasitic Ice Worm
- Parasitic Worm
- Parcat
- Pargite
- Paricha Root
- Parlaxian
- Party Horse
- Parwan
- Pascagoula Humanoid
- Pasharti
- Pashvi
- Pathfinder (Planet Raptor)
- Patient Zero
- Patitite
- Patriqu-ro
- Patrolian
- Pau'an
- Paul's Species
- Paulan
- Pavone
- Pavonisian
- Pawex 5uerte's species
- Paxan
- Pazensh
- Pearl
- Pearlweed
- Pearly Clamclamp
- Peat-Bladder
- Peckish Aristocrab
- Peckster
- Pedal aliens (alva's world)
- Pedepod
- Peep-Peep's species
- Peeper
- Peeper Beetle
- Peevlik
- Peewee
- Peg-doll
- Peko-Peko
- Pel
- Peladonian
- Pelezeean
- Pelgrin
- Peliar Zelian
- Pelimosian
- Peliwan
- Pellet Posy
- Pellonian
- Pemalite
- Pengauani
- Pengwing
- Penk's species
- Pentapod (Alien Worlds)
- Pentapod (Attitude)
- Penzatti
- People of Clypse
- People of Fornax
- People of Survive
- People of Ysan Tertiary
- People of the Green Mist
- People of the Ocean
- Pequeninos
- Peran
- Perfectly Normal Beast
- Perman
- Peroenian
- Perse
- Perseid
- Person from the Center of the Universe
- Persona
- Pescaton
- Petalar
- Petaur
- Peter Quill
- Petrasyl
- Petrifold Regression
- Petrosapien
- Peybrok
- Pezzer Petal
- Pfhor
- Pfifltriggi
- Phaazoid
- Phaedan
- Phaedan Berry Vine
- Phaedan Lizard
- Phaedon
- Phage (MARDEK)
- Phagor
- Phaladon
- Phamysht
- Phantasmo
- Phantom (Evolve)
- Phantom (Final Fantasy)
- Phantom (Prey)
- Phantoon
- Pharisee
- Pharotine
- Phaz-Ing
- Phaznozz
- Phazon
- Phearax
- Phentari
- Pheragot
- Phib
- Phibian
- Phidna
- Phil's species
- Phileni
- Phindian
- Phlone
- Phlovomite
- Pho Ph'eahian
- Phocean
- Phosbat
- Phosiab
- Phosphorescent Monster
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