| Square Heads Games | Developer | |
| Square Table Games | Developer | |
| Square-Enix | DeveloperPublisher | |
| SquareCircle | Developer | |
| SquareDev | Developer | |
| SquareFox | Developer | |
| SquareSoft | DeveloperPublisher | |
| SquareSoftAS,JP | Publisher | |
| SquareSoftJP | Publisher | |
| SquareSoftJP,NA | Publisher | |
| Squaregames | Developer | |
| Squarehead Games | DeveloperPublisher | |
| Squaresoft | DeveloperPublisher | |
| Squareworx Studio | Developer | |
| Squeezebotjam | Developer | |
| Squeydar | Developer | |
| Squid Games | Developer | |
| Squid Inc. | Developer | |
| Squid Inc. Productions | Developer | |
| SquidCastle | Developer | |
| SquidInABox | Developer | |
| SquidSinsSquad | Developer | |
| Squiddershins | Developer | |
| Squidly Games | Developer | |
| Squidney | Developer | |
| Squidsheep | Developer | |
| Squinky | Developer | |
| Squire Grooktook | Developer | |
| Squires | Developer | |
| Squirrel | Developer | |
| Squirrel Soft Company | Developer | |
| SquirrelHorse | Developer | |
| Squirrelsoft Studios | Developer | |
| SquishyBear | Developer | |
| SquishyTurtleGames | Developer | |
| Sr Bread | Developer | |
| SrPelo | Developer | |
| Srednuht | Developer | |
| Sreenington | Developer | |
| Sroozy | Developer | |
| SrtaFrost | Developer | |
| Sssnize Game Studios | Developer | |
| St Bride's School | Developer | |
| St0rmCat | Developer | |
| StabAlarash | Developer | |
| Stabalot | Developer | |
| Stabeor | Developer | |
| Stable Alpha | Developer | |
| Stacey Mason | Developer | |
| Stack | Developer | |
| Stack Computer Services | Publisher | |
| Stackhead Games | Developer | |
| Stacy and Carson | Developer | |
| Stadlbauer | Publisher | |
| Staff Razas | Developer | |
| Staffy Games | Developer | |
| Stage 2 Studios | DeveloperPublisher | |
| Stage Clear Studios | DeveloperPublisher | |
| Stagfoo | Developer | |
| Staghorn Games | Developer | |
| Stainler | Developer | |
| Stainless Games | DeveloperPublisher | |
| Stainless Software Ltd. | Developer | |
| Stainless Steel Studios | Developer | |
| Stainless Studios | Developer | |
| Stampeder525 | Developer | |
| Stan Shebs | Developer | |
| StandOffSoftware | Developer | |
| Standard Enemy | Developer | |
| Standby | Developer | |
| Standfast Interactive | Publisher | |
| StandingStill | Developer | |
| StanfordStudentGames | Developer | |
| Stani_Slav | Developer | |
| Stanley | Developer | |
| Stanley Associates | Developer | |
| Stanley Creative | Developer | |
| Stanley Design Team | DeveloperPublisher | |
| Stanza Creative Circle | Developer | |
| Stapz | Developer | |
| Star Banner Games | Developer | |
| Star Child | Developer | |
| Star Fruit | Developer | |
| Star Game Studios | Developer | |
| Star Games | Developer | |
| Star Palm Games | Developer | |
| Star Theory Games | Developer | |
| Star Vault | DeveloperPublisher | |
| Star Yolk Games | Developer | |
| Star'Up Game Studio | Developer | |
| StarBlade | Developer | |
| StarByte Studios | Developer | |
| StarChart Interactive | Developer | |
| StarCraft | Developer | |
| StarCraft, Inc. | DeveloperPublisher | |
| StarCrusaders | Developer | |
| StarDragon | Developer | |
| StarDreamIX | Developer | |
| StarFleet Academy Software | Developer | |
| StarFur Industries | Developer | |
| StarKnightStudio | Developer | |
| StarPilot | Developer | |
| StarQuail Games | Developer | |
| StarSkull | Developer | |
| StarSystemStudios | Developer | |
| StarWraith 3D Games | DeveloperPublisher | |
| Starbex Systems | Developer | |
| Starbit Light | Developer | |
| Starblade | Developer | |
| StarboltStudios | Developer | |
| Starbreeze | Developer | |
| Starbreeze Studios | DeveloperPublisher | |
| Starbuck5 | Developer | |
| Starburnt Studios | Developer | |
| Starbyte Software | DeveloperPublisher | |
| Starcade.io | Developer | |
| Starcraft | Publisher | |
| Starcruiser Studio | Developer | |
| Stardock | DeveloperPublisher | |
| Stardust 17 | Developer | |
| Stardust-Dev | Developer | |
| StardustArtPlay | Developer | |
| StardustValley | Developer | |
| Starfire Studio | Developer | |
| Starfish | DeveloperPublisher | |
| Starfish JP | Publisher | |
| Starfish SD | DeveloperPublisher | |
| Starfish SDJP | Publisher | |
| Starhouse | Developer | |
| Stark_Azure | Developer | |
| Starkium | Developer | |
| Starkom | Developer | |
| Starksss | Developer | |
| Starlight Game Studio | Developer | |
| Starlight Marry | DeveloperPublisher | |
| Starlight Software | Publisher | |
| Starlight Studios | Developer | |
| Starlight Visual | Developer | |
| Starmage | Developer | |
| Starmongoose | Developer | |
| Starpak | Developer | |
| StarrainArts | Developer | |
| Starrite Games | Developer | |
| StarryMan | Developer | |
| StarshineSy | Developer | |
| Starship Assassin | Developer | |
| Starsign | DeveloperPublisher | |
| Starsky Wong | Developer | |
| Starsoft | DeveloperPublisher | |
| Starsoft Development Laboratories | Developer | |