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SikanSiktariSikurdian
Sil's SpeciesSilacoidSilas
Silas AdenSilastic Armourfiends of StriteraxSilent
SilentiumSilentium's creatorsSilgrian
SilicSilica ParasiteSilicate
Silicate HarvesterSilicoidSilicoid (Sword of Stars)
SilikaSilurianSilvermist
Silvestri TraceSimsol's SpeciesSimulacrum
SimulanSindareenSindû
SinestroSingularity PriestsSiniteen
Sink CrabSinkarSinker (Lilo & Stitch)
SinmurSinordSintillian
SinurianSionian SkupSir Derek Janus
Siren (Lanfeust of Troy)Siren (Roswell Conspiracies)Sirez (Jordan Baylor)
SirianSirian (Power Rangers)Sirian (Proof)
SirindeSirius Cybernetics CorporationSister of Mercy
SithSitterSivaoan
SkaaSkaarfSkaarj
SkagSkakmatSkakoan
SkalderSkaletSkandar
SkarasenSkaro Electric EelSkaven
SkedarSkeeboSkeeterskate
SkeeverSkeksisSkel
Skeletal SteedSkeleton (Minecraft)Skeletor
SkeltegSkettoSkewer
SkinnySkinny (Steven Universe)Skinwalker
SkitariiSkitterSkitter Leaf
SkizanSkootch's speciesSkopander
SkorahSkorr (Star Trek)Skraaldian
SkreegitSkreevSkrel
SkrillSkrillingSkrit Na
SkrommSkruggSkrull
SkulkSkullmonkeysSkultera
SkutterchuckSkuzzalopeSkwoid
Sky LordsSky Lords of IndigarrSky Whale
SkymooSkypieanSkythulhu
Skywhale (Orion's Arm)SkywrackSkärtisian
SlademanSlamworm's SpeciesSlan
SlarpaxSlaughterfishSlaughtering Rat People
SleenSleepwalkerSleestak
SliakSligSlime-snake
Slime Creatures from Outer SpaceSlimebioteSlinger
SlinkerSlipskullSlissü
SlithSlith (Star Wars)Slithergee
Sliver-SlurperSljeeSload
SlobbererSlogSlogg
SloogarianSloth (Arena)Slothien
Slow OneSludirSlug (Orphanage)
Slugger (Lilo & Stitch)SluggoSluissi
SlurfSlurm WormSlushy (Lilo & Stitch)
SlylandroSlytherSmasher
Smoky ProggSmoky QuartzSmud
SmurglSnake AlienSnake Person
SnakemanSnarfSnark
SnarlfishSnarlmaneSnavian
Snipe ThornSnivvianSnogar
SnokeSnootySnorgeth
SnoutlingSnovemdomasSnow-Bulb
SnowHornSnow BearSnow Beetle
Snow CentipedeSnow MonsterSnow Mynock
Snowflake ObsidianSnowmouseSnuffle
SnuuthSo'QuaalSobram
Soft OneSogbirdSogflower
SogowanSohngSolarian
Solarian (Asimov)Solarian (Embrace the Darkness)Solarian (Proof)
SolarisSolaris (Sonic '06)Solaryd
Solaryd EmpireSolasSolatian
SolbrechtSolemSolomon
Solomons' speciesSolonianSolrock
Solum MemorySolumnianSomalcygot
Son GohanSong-bushSonorosian
SontaranSontilaSooman
SophonSordSordinian
SorkiSorn (Gandahar)Soro
SororianSororian ApeSorrent
SorrusianSotoraggianSou(ou)shi
SoulSoul PirateSoul Worms
Souliman AktapanSouthern-hemispheric Sea ScorpionSouthern Hydra
Sovereign (Marvel)SowerSpace-Bat
SpaceGodzillaSpace Amoeba (Star Trek)Space Amoebas
Space BearSpace BeeSpace Dragon
Space Entity (The X-Files)Space GoatSpace Grazer
Space GyaosSpace InvadersSpace Kraken
Space Mantis-LizardSpace Marine (Warhammer 40,000)Space Monster
Space OwlSpace ParasiteSpace Pirate
Space Pirate (One Piece)Space RatSpace Slug (Distant Worlds)
Space SpiderSpace SquidSpace Squid (Brewster Rockit)
Space Squid (The Penguins of Madagascar)Spacer (All Tomorrows)Spacey
Spade-NoseSpade-headed SmookaSparklium
Sparky (Lilo & Stitch)SparrowheadSpartan
SpartoiSpathiSpawn of Cthulhu
SpeagullSpeargrubSpecies 8472
Species 8472 Energy Focusing ShipSpecies from the Sun-Singers of AkhetSpectral Wraith
SpectralidSpectreSpemin
SphaxSphere BuilderSphere Doomer
SpheroidSphoeroidSpice Weasel
SpicularianSpider (Minecraft)Spider (The Grim Adventures of Billy and Mandy)
Spider AlienSpider GuardianSpider Mastermind
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