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- Sangtee - Members of the single sex Sangtee Empire, ruled by an Emperor called the "Kreel".
- Saturnians - The Saturnian Red, White and Yellow races are descended from clones of the Green, White and Yellow Martians. *Fura a Saturnian warlord from 3000 A.D. appeared in Batman #26, an enemy of the Batman of 3000 AD.
- Savothians - The Savothians are a camel-like advanced humanoid species native to the planet Savoth. They have entertained a long friendship with all members of the Flash Family.
- Scissormen - metafictional characters who inhabit a world called Orqwith
- Slaggites - The Slaggites (also known as Spitroids) from the planet Slagg survived a near genocide after they rebelled against Citadel rule, represented by Shlagen of the Omega Men.
- Slyggians
- Sornaii - The Sornaii are an apparently multiversally aware alien race who seem to serve a role similar to that of the Monitors but on a lesser scale.
- Space Dolphins - Space Dolphins are alien cetaceans capable of surviving and navigating in the vacuum of outer space. Two space dolphins have been seen in the company of Lobo
- Spider Guild - The Spider Guild are a race of alien merchants, traders, slavers and conquerors from the Vega Star System.
- Starros -
- Statejians - war-like race of Qualar IV
- Sputans - sentient race made up of larva and bacteria.
- Sumal - race exterminated by the Progeny located in the Progenitor's Galaxy.
Read more about this topic: List Of Alien Races In DC Comics