- Recoome's species
- Recyclon
- Red-Eyed Alien (Star Wars)
- RedEye
- Red Bubblimp
- Red Bulborb
- Red Dragon
- Red Eye
- Red Leech
- Red Martian (Barsoom)
- Red Martian (DC)
- Red Mountain-Spike
- Red Nebula species
- Red Pikmin
- Red Slime
- Red Spark
- Red Spectralid
- Red Tree Runner
- Red Weed
- Red Weed (The Pit)
- Red Willow
- Red Wing
- Red Worm
- Red Xenomorph
- Redolan
- Redul
- Reedol
- Reefback Leviathan
- Reek
- Reeser Bird
- Reetou
- Reever Plant
- Reflec
- Reflectian
- Refusian
- Regent (Battleship)
- Regineer Teed
- Regorian
- Regulan Bloodworm
- Regulator
- Regulators
- Reigat
- Reigubas
- Rellarin
- Relserk
- Reman
- Remmilian
- Remnant
- Remnant (Doctor Who)
- Remnant (Endless Space)
- Remoolian
- Remoraxian
- Remulakian
- Ren Miruu
- Rentok
- Reo
- Reol
- Repair Droid (Cannon Busters)
- Replicator
- Replicator Plant
- Reptavian (Star Trek)
- Repticore
- Reptile Man
- Reptilian (Alien Exorcism)
- Reptilian (Futurama)
- Reptilian (Godzilla)
- Reptilian (Lost Tapes)
- Reptilianoid Betrushian
- Reptilicus (Metroid)
- Reptilionian (God's Gang)
- Reptilonian
- Repto-Humanoid
- Reptoid
- Reptrox
- Repugnian
- Reshar
- Reska
- Resolve Class
- Resputi-seal
- Resrenari Flying Temaroc
- Retepsian
- Retiarius
- Reticulan (Sliders)
- Reticulan (UFO Afterlight)
- Reticulan Squirt Worm
- Reuben (Lilo & Stitch)
- Reussi
- Reveth
- Revonnahgander
- Revwien
- Rewq
- Rexorian
- Reyan
- Rhaandarite
- Rhan-Tegoth
- Rhapsodian
- Rhedogian
- Rhedosaurus
- Rhen Varite
- Rhetonian
- Rhinoceros Humanoid
- Rhinofork
- Rhizomian
- Rhodian
- Rhu-chalik
- Rhyl
- Rhynadon
- Rhynth
- Ri'Dar
- Ribbonswimmer
- Ribeye Knight
- Ribosian
- Richie
- Richter
- Richter (Lilo & Stitch)
- Ricochetal Saltator
- Rict's Species
- Ridadi
- Ridden
- Rider (Remnants)
- Riekling
- Riftborn
- Riftworm
- Rigel X Butterfly
- Rigellian
- Rigellian (BraveStarr)
- Rigellian (Star Trek)
- Rigellian (Star Wars)
- Rigellian (The Simpsons)
- Rigellian Rump-Beast
- Riileb
- Riim
- Rikol
- Rikti
- Rilken
- Rill
- Rimerunner
- Rindamil
- Rindian
- Rine Berren
- Ring Builder
- Ringed Cord
- Rinol Jag
- Riorian
- Ripley 8
- Ripoblus
- Ripper (Fade to Silence)
- Ripper (Metroid)
- Ripper (Pacific Rim)
- Ripper (Stalag-X)
- Ripper (Star Virus)
- Ripper (Warhammer 40,000)
- Ripper II
- Ripple Fairy
- Rishanan
- Rishi Eel
- Rishii
- Rithuan
- River Ghost
- Riverfruit
- Riverweed
- Rivus
- Rkrzzzîîk
- Rlim Shaikorth
- Ro-Man
- Roadkill Creature
- Roarkmeli
- Rob 64
- Robo-Pirate
- Roboform
- Roboo
- Robot
- Robot (Cyberiad)
- Robot (Lost in Space)
- Robot (Lost in Space, 2018)
- Robot (Rogue Galaxy)
- Robot (Skylanders)
- Robot King
- Robot Shooty Thing
- Robot Worms (Megas XLR)
- Robot Yeti
- Robotoid
- Roccan
- Rock-bug
- Rock-vulture
- Rock (Shadow Raiders)
- Rock Alien (Futurama)
- Rock Alien (Transformers)
- Rock Beast
- Rock Creature
- Rock Creature (Dot in Space)
- Rock Giant
- Rock Lizard
- Rock Lord
- Rock Man
- Rock Monster (LEGO Rock Raiders)
- Rock Person
- Rock Pikmin
- Rock Sucker
- Rock Turtle
- Rock Wart
- Rock Worm
- Rockhopper
- Rodex
- Rodian
- Rodisar
- Roebekampus Multipede
- Roger's Species
- Roggwart
- Rogor
- Rogue Xenomorph
- Rokkna
- Rolie Polie Olie
- Roller
- Rollerox
- Roltean
- Roman Candle
- Romulan
- Ron
- Rondor
- Ronto
- Rookuk
- Roomboo
- Roonan
- Roondaslock
- Root Shark
- Roove
- Ropagu
- Roquarri
- Rorkill
- Rorskal
- Rosanian
- Rosh
- Rosie the Seedrian
- Rossorworm
- Roswell Alien (The Peterson Case)
- Roswellian
- Rosyfin
- Rot Lop Fan's species
- Rotary Mole
- Rothen
- Rotik
- Rototavuul
- Rotum Luxo
- Round Alien (Captain Star)
- Roundie
- Rour
- Rover
- Rovie
- Roving Wave-lattice of Shandaloon
- Rowra
- Roylan
- Roza's Species
- Rseikharhl
- Ru
- Ru Ha'rus
- Rubelans
- Ruby-Throated Kete
- Rudd Orbin
- Rugger
- Rugose Floater
- Ruin Haunter
- Rukh
- Rukhan
- Ruktor
- Rull
- Rulon
- Rump
- Runny
- Runyip
- Ruping
- Ruporeed
- Rutan
- Rutani
- Rutanian
- Rutian
- Ruu
- Ruuhtian
- Ruurian
- Ruusanian
- Rwook
- Rybet
- Rycrit
- Rykengolls
- Rykor
- Rylattu
- Rympth
- Rynax
- S'glhuoan
- S'krrr
- S'kytri
- S'reeg
- S'thanth
- S'thg'r
- S.P.A.C.E.
- SA-X
- SCP-1342-3
- SCP-1560
- SCP-1660-7
- SCP-2845
- SCP-860-2
- SIR Unit
- SPEWEY's species
- SRTT
- STPC30 Lolo, Kaka and Toto thinks some mistake has occurred
- Saarg
- Saberbat
- Saberjowl
- Sabre Bear
- Sac-Back
- Sacul
- Saffa
- Saganian
- Sagar Tree
- Saheelindeeli
- Saibaman
- Sail Person
- Sailion
- Sailor
- Sailor Scouts (Sailor Moon)
- Saiyan
- Sakaar native
- Sakae
- Sakiyan
- Sakkra
- Saksonan
- Salakan
- Salamander (Ribbit King)
- Salamandrian
- Salander
- Salarian
- Salaxalan
- Salaxalan Horse
- Saldisian
- Salky Hound
- Sally (Oblivion)
- Saloah-Tarh
- Salostophusian
- Salt Vampire
- Saltici
- Salusian
- Salza 2 Indigenous Life-Form
- Samanian
- Samhari
- Samian
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