- Pineal Eye
- Planet 4546B
- Planet X (Dinosaurs vs Aliens)
- Pleakley
- Plejaren
- Porax-38 starfighter
- Potent Poppy
- Pou
- Poultra
- Power Flower
- Pox
- Praster Ommlen
- Praying Maberration
- Precursor (Pacific Rim)
- Predalien
- Predator Temple
- Primus
- Probe
- Pru Sweevant
- Pterobuzzard
- Pting
- Punk Rock Dumpster Dweller
- Purity
- Purple-Skinned Humanoid
- Pylon
- Pyronica
- Pyrox
- Quantonium
- Queen Tyr'ahnee
- Quiggold
- Quinn (Arena)
- R'lyeh
- R2-D2
- Rabbids
- Raijin
- Raiju
- Rancor
- Rathtar
- Ray gun
- Razor Claws
- Reconnaissance Troop Transporter
- Red-Skinned Crustacean
- Reed Case
- Remoolian
- Reptilian
- Reptilian (Godzilla)
- Reptilian (Lost Tapes)
- Reptilian Ringleader
- Reptoid
- Reuben
- Revonnah
- Revonnahgander
- Rhan-Tegoth
- Ripper (Pacific Rim)
- Rlim Shaikorth
- Robby the Robot
- Robot Monster
- Robot Overlord
- Robot Squid
- Roger Smith
- Rogor
- Roman the Fabulist
- Roodown
- Rook Blonko
- Rose Farrar
- Rosebud
- Roswell UFO crash
- Roughback Batfish Alien
- Rudy
- Runner
- Russian UFO crash
- SCP-1560
- SCP-2845
- Saberbat
- Saibamen
- Samus Aran
- Sand Shark
- Sandworms
- Sarco Plank
- Sarris
- Satan
- Satan (Resistance)
- Satan (Salvation War)
- Saturnian Werewolf
- Saucer Man
- Scar
- Scorab
- Scorpion-Fly
- Scratazon
- Scroop
- Sebulba
- Sekotan Personal Starship
- Serleena
- Servitor of the Outer Gods
- Sesharrim
- Sh'lainn
- Shaboom Shaboom
- Shadoen
- Shadowscythe Alien
- Shakka
- Shoggoth
- Shorty
- Shrikethorn
- Shrimp-Headed Humanoid
- Silas
- Silver Moth
- Siren (Lanfeust of Troy)
- Siren (Roswell Conspiracies)
- Six
- Skeletal Fish
- Skeleton Shrimp Alien
- Skelteg
- Skiff Xounellius
- Skinny Bob
- Skurd
- Slattern
- Slender Man
- Slim
- Slime
- Slime Creatures from Outer Space
- Slipstream
- Slug-Like Alien
- Sogowan
- Solarian
- Soltec
- Sonic The Hedgehog
- South Park Universe
- Southern-Hemispheric Sea Scorpion
- Space-Eater
- Space Bee
- Space Brains of Palos Verdes
- Space Monster
- Space Mutants
- Space Squid (The Penguins of Madagascar)
- Sparky
- Spectral Wraith
- Spider (The Grim Adventures of Billy and Mandy)
- Spider Bunny
- Spider Mastermind
- Spider of Leng
- Spikey
- Spiky Bulba
- Spinner (Arena)
- Spitter
- Split Guy
- Spore Spawn
- Sporjot
- Spring-heeled Jack
- Sta'abi's Species
- Stalk Eyes
- Star Butterfly
- Star Galleon-class frigate
- Starcast
- Starchild
- Stargate
- Starscream
- Steelhead
- Stegaceratops
- Stitch
- Strider (SCP Foundation)
- Strong Sunflower
- Strono Tuggs
- Super Hot Giant Alien
- Super Super Big Doctor
- Superman
- Supervisor
- Supi
- Symbiote (Marvel)
- Synapse Guard
- Syresh Vöōs
- T'Nuk Layor
- TIE/sh VIP shuttle
- Tamama
- Tarkatan Xenomorph
- Teetonian
- Tek's Species
- Tek (Titan A.E.)
- Temporal Worm
- Tentacle Monster
- Tentacles from Planet X
- Tera Con Prime
- Terron
- Teryx
- Test Tube Aliens
- Thames River Monster
- Thanos
- The Alien
- The Alien Files: UFOs Under Investigation
- The Blob (The Simpsons)
- The Brotherhood of Light
- The Fallen
- The Great Gazoo
- The Greys (Escape from Planet Earth)
- The Guardian
- The Horrifying Sweaty One-Armed Monstrosity
- The Horse
- The Inquisitor
- The Little A'Le'Inn
- The Man from Planet X
- The Master
- The Nerdlucks
- The Other
- The Rake
- Thermians
- Thoad
- Thrust
- Thundercracker
- Thurman
- Thurman's Species
- Thuum'ha
- Titan (Final Space)
- Tiyanki Matriarch
- Tommyknocker
- Torrance
- Tranquility
- Transformer
- Travis Walton abduction
- Trespasser
- Tribore
- Triceratorse
- Trilobite
- Tripod
- Trogg
- Troll (Face Off)
- Tryvuulian
- Tsathoggua
- Tundro
- Turnbuckle
- Twonkies
- Tzitzimitl
- UFO
- USO
- Ufology
- Ultraman
- Ummite
- Uncle Martin
- Unicron
- Unidentified Aliens (Ace Ventura)
- Unknown planet
- Unnamed Aliens (Ace Ventura)
- Uranian
- Uriel
- Vaa
- Valcan
- Valeronian
- Vampire (Roswell Conspiracies)
- Vampire Squid (Sanctuary)
- Vampire Squid Alien
- Van Meter Visitor
- Vegetable Man
- Veined Octopus Alien
- Velgrox
- Velgrox Captain
- Venom
- Ventrexian
- Venusian (In the Walls of Eryx)
- Venusian (It Conquered the World)
- Venusian Spider
- Venusian Tarantula
- Verne
- Vindicator-class heavy cruiser
- Viro
- Visitor (South Park)
- Visitor (The Visitor)
- Vober Dand
- Voltarian
- Voltra
- Vorb
- Walrus Merchant
- Walter's Quetzalcoatl
- Wandjina
- Watcher (Hellboy)
- Weezil
- Wendigo
- Werthrent
- Whip
- Widowmaker
- Witch (Face Off)
- Witch (Stan Lee)
- Woolie
- World Devastator
- Worldender
- Worms (MIB)
- X-TIE Fighter
- Xanthar
- Xeexi
- Xenomorph Drone
- Xenomorph Queen
- Xenomorph Warrior
- Xenomorph XX121
- Xenomorph blood
- Xenos
- Xenu
- Xindi
- Yacker
- Yautja
- Yekubian
- Yerdua Poison-Spitter
- Yeti
- Yeti (Roswell Conspiracies)
- Yhoundeh
- Ymir
- YoRHa
- Yoda
- Yoda's Species
- Yodude
- Yokian
- Yokian Fleet Commander
- Yuggoth
- Yvonne's Xochipilli
- Z-Bots
- Zanlak
- Zaralok
- Zartog
- Zeb Orrelios
- Zed
- Zeep Xanflorp
- Zephyrian
- Zeta
- Zigerion
- Zim
- Zoff
- Zoog
- Zorak
- Zorgons
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