List of fictional alien species: S
| Name | Source | Type |
|---|---|---|
| "Species" | Species and its sequels | Bipedal humanoid female aliens, and quadrupedal male aliens. |
| Saiyan | Dragon Ball Z | a naturally aggressive warrior race who are, purportedly, the strongest warriors in the fictional Dragon Ball universe. Most of the Saiyans were exterminated by galactic overlord Frieza after Goku was born. With only few known survivors, they are functionally extinct. With the exception of their monkey-like tails, all Saiyans have an outward appearance identical to humans but with a larger, muscular build. |
| Sakkra | Master of Orion | |
| Sal-Kadeem | Utopia | |
| Salarians | Mass Effect | |
| Sandworm | Dune universe | |
| Sangheili | Halo | |
| Santeeians | Bravest Warriors | Santeeians worshipped Wankershim before being vaporized to become one with Wankershim. |
| San 'Shyuum | Halo | |
| Sariens | Space Quest | |
| Sarturians | Utopia | |
| Sathar | Star Frontiers | worm-like tentacled antagonists |
| Sau-Bau | Battlelords of the 23rd Century | |
| Scarrans | Farscape | Humanoid |
| Schniarfeurs | Valérian and Laureline | |
| Scorvians | Farscape | Humanoid |
| Scwozzworts | Lunchbox and the Aliens | Squid-like and non-humanoid |
| Screwheads | Invader Zim | They were enslaved by the Irken Empire and currently the species works the Conveyor Belt Planet. |
| Scrin | Command & Conquer | |
| Sebaceans | Farscape | Humanoid. Genetically engineered offshoot of humans, harvested from Earth 27,000 years ago. Lower heat resistance than humans, but double the average life expectancy |
| Second through Last Men | Olaf Stapledon's Last and First Men | |
| Sectoids | X-COM: UFO Defense | |
| Seekers | Advent Rising | |
| Selay | Star Trek | |
| Selkath | Star Wars | Humanoid |
| Seraphim | Supreme Commander | |
| Sergeant Keroro | Sgt. Frog | |
| Sergeant Major Kururu | Sgt. Frog | |
| Séroni | Space Trilogy | Humanoid |
| Shadows | Babylon 5 | Arachnid, capable of phase-shifting to turn invisible |
| Shalka | Doctor Who | |
| Sharrh | C. J. Cherryh's Alliance-Union universe | |
| Sheeda | Grant Morrison's Seven soldiers of Victory megaseries | |
| Sheliak | Star Trek | |
| Shevar | Ascendancy | |
| Sheyangs | Farscape | |
| Shi'ar | Marvel Comics | Humanoid |
| Shinari | Imperium Galactica II: Alliances | |
| Shingouz | Valérian comics | |
| Shivans | Descent: FreeSpace – The Great War | |
| Shoggoths | H. P. Lovecraft | |
| Sholans | Lisanne Norman - Sholan Alliance | Feline Humanoid |
| Shofixti | Star Control | |
| Shonunin | C. J. Cherryh's Alliance-Union universe | |
| Shroobs | Mario & Luigi: Partners in Time | |
| Silacoids | X-COM: UFO Defense | |
| Silicoids | Master of Orion | |
| Silfen | Peter F. Hamilton's "Pandora's Star" | Humanoid |
| Silver Surfer | Marvel Comics | |
| Sirians | Serious Sam: The First Encounter | |
| Skaarj | Unreal (series) | |
| Skedar | Perfect Dark | |
| Skinnies | Starship Troopers | Arachnoids |
| Skolarians | Zak McKracken and the Alien Mindbenders | |
| Skroderiders | Vernor Vinge's "A Fire Upon the Deep" | Sessile, plant-like beings mounted in personal mechanical vehicles ("skrodes") |
| Skrulls | Marvel Comics | |
| Slaughtering Rat People | Invader Zim | Physiologically similar to giant rats, the Slaughtering Rat People inhabited the planet Blorch before it was conquered by Invader Skoodge. Blorch was converted into a parking structure planet. |
| Slavers (see Thrint) | Larry Niven's Known Space | |
| Slitheen | Doctor Who | |
| Sludge | Ben 10 | mud-aliens |
| Slylandro | Star Control | |
| Snakemen | X-COM: UFO Defense | |
| Snarks | Marvel Comics | |
| Snotlings | Warhammer 40,000 | Humanoid |
| Snovemdomas | Ascendancy | |
| Solaris | Stanisław Lem's Solaris | |
| Solomon Family | 3rd Rock from the Sun | |
| Solon | Haegemonia: Legions of Iron | |
| Son'a | Star Trek | |
| Sontarans | Doctor Who | Stocky Humanoid |
| Soomanii | Utopia | |
| Sorn | C. S. Lewis' Space Trilogy | |
| Soro | David Brin's Uplift Universe | |
| Sosiqui | The Journeyman Project 3: Legacy of Time | |
| Southern Aliens | Bravest Warriors | Each have thick southern accents. |
| Space Pirates | Metroid series | |
| Space Chickens | Bravest Warriors | Physiologically similar to pigeons. |
| Spathi | Star Control | |
| Species 8472 | Star Trek | |
| Spibbley | Invader Zim | |
| Spiridons | Doctor Who | |
| Spirits | Stargate SG-1 | Humanoid |
| Splixson | Ben 10 | |
| S'pht | Marathon Trilogy | |
| Spoo | Babylon 5 | |
| Squirps | Super Paper Mario | |
| Squiz-Quijy | Utopia | |
| Ssora | Renegade Legion | Reptilian |
| Strogg | Quake II and Quake 4 | |
| Stsho | C. J. Cherryh's Chanur novels | |
| Stu | Pixar's Lifted (2006 film) | |
| Sugarbellies | Bravest Warriors | They speak in high-pitched voices. |
| Suliban | Star Trek | Humanoid |
| Sungs | 2300 AD | |
| Sun-Dog | Terry Pratchett's The Dark Side of the Sun | Large sentient beings that live in the vacuum of space. Capable of traveling through hyperspace. Any object they engulf will travel through hyperspace with them. The Sub-Dog species operate a successful business transporting spaceships across vast distances for other races in exchange for currency. |
| Supox | Star Control | |
| Serrakin | Stargate SG-1 | Humanoid |
| Swaparamans | Ascendancy | |
| Sycorax | Doctor Who | Humanoid |
| Sye-Men | Battlelords of the 23rd Century | |
| Sykarians | Farscape | Humanoid |
| Syreen | Star Control | Humanoid |
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