| Seb Woodland | Developer | |
| SebP | Developer | |
| Seba Games Dev | Developer | |
| Seba Labo | Developer | |
| SebaGamesDev | Developer | |
| Sebadst | Developer | |
| Sebagamedev | Developer | |
| Sebagamesdev | Developer | |
| Sebajuste | Developer | |
| SebasDev | Developer | |
| SebasRez | Developer | |
| Sebastian | Developer | |
| Sebastian Biala-Learmonth | Developer | |
| Sebastian Caron | Developer | |
| Sebastian Lague | Developer | |
| Sebastian Martinez | Developer | |
| Sebastian Scaini | Developer | |
| Sebastien Vermeulen | Developer | |
| Second Dimension Games | Developer | |
| Second Dimension R&T, LLC | Developer | |
| Second Garage | Developer | |
| Second Maze | Developer | |
| Second Order | DeveloperPublisher | |
| Second Shrine | Developer | |
| Second Step Studios | Developer | |
| Secret Base | Developer | |
| Secret Exit | DeveloperPublisher | |
| Secret Foxfire | Developer | |
| Secret Level | Developer | |
| Secret Stash Games | Publisher | |
| Secret Tunnel | Developer | |
| Secret Tunnel Entertainment | DeveloperPublisher | |
| SecretBasment | Developer | |
| SecretJuice1 | Developer | |
| SecretPocketCat | Developer | |
| Section 3 | Developer | |
| SectorCodec | Developer | |
| Sectordub | Developer | |
| Sedge | Developer | |
| Sedgwick2K | Developer | |
| Seed Interactive | Developer | |
| Seed Studios | Developer | |
| Seed by Seed | DeveloperPublisher | |
| Seed9 Entertainment | DeveloperPublisher | |
| SeedBolt Studios | Developer | |
| SeedOflemon | Developer | |
| SeedStudios | Developer | |
| Seeds of Love | Developer | |
| Seemingly Pointless | Developer | |
| Seere | Developer | |
| Seerinx | Developer | |
| Seet | Developer | |
| Sega | DeveloperPublisher | |
| Sega (EU) | Publisher | |
| Sega (EU/JP) | Publisher | |
| Sega (JP) | Publisher | |
| Sega (JP, EU) | Publisher | |
| Sega (JP/EU) | Publisher | |
| Sega (license) | Publisher | |
| Sega / | Publisher | |
| Sega AM-2 | Developer | |
| Sega AM1 | DeveloperPublisher | |
| Sega AM2 | DeveloperPublisher | |
| Sega AM3 | DeveloperPublisher | |
| Sega AM6 | Developer | |
| Sega AM7 | Developer | |
| Sega CS | Developer | |
| Sega CS R&D 2 | Developer | |
| Sega CS1 | Developer | |
| Sega CS1, | Developer | |
| Sega Corporation | Publisher | |
| Sega EU | Publisher | |
| Sega EU/AU | Publisher | |
| Sega Europe | Publisher | |
| Sega Falcom | Developer | |
| Sega InterActive | Developer | |
| Sega Interactive | Developer | |
| Sega Interactive Development Division | Developer | |
| Sega JP | Publisher | |
| Sega JP, EU | Publisher | |
| Sega JP/EU | Publisher | |
| Sega JP/PAL | Publisher | |
| Sega Japan | Developer | |
| Sega Midwest Studio | Developer | |
| Sega NA | Publisher | |
| Sega NA, EU | Publisher | |
| Sega NA/EU | Publisher | |
| Sega NA/PAL | Publisher | |
| Sega PAL | Publisher | |
| Sega PC | DeveloperPublisher | |
| Sega R&D 2 | Developer | |
| Sega R&D2 | Developer | |
| Sega Racing Studio | Developer | |
| Sega Rosso | Developer | |
| Sega Sammy | DeveloperPublisher | |
| Sega Sports | Publisher | |
| Sega Sports Japan | Developer | |
| Sega Studio USA | Developer | |
| Sega Studios | Developer | |
| Sega Studios Australia | Developer | |
| Sega Technical Institute | Developer | |
| Sega Toys | DeveloperPublisher | |
| Sega WOW | Developer | |
| Sega Wow | Developer | |
| Sega Yonezawa | Publisher | |
| Sega interActive | Developer | |
| Sega of America | Publisher | |
| Sega of Europe | Developer | |
| Sega-AM1 | Developer | |
| Sega-AM2 | Developer | |
| Sega-AM3 | Developer | |
| Sega-AM4 | Developer | |
| Sega-Gremlin | Publisher | |
| Sega/ | Publisher | |
| SegaEU | Publisher | |
| SegaEU,NA | Publisher | |
| SegaJP | Publisher | |
| SegaJP,KO,NA | Publisher | |
| SegaJP,NA | Publisher | |
| SegaJP/PAL | Publisher | |
| SegaNA | Publisher | |
| SegaNA/EU | Publisher | |
| SegaNA/PAL | Publisher | |
| SegaPAL | Publisher | |
| SegaSoft | DeveloperPublisher | |
| SegaTectoyBR | Publisher | |
| Sega[7] | Publisher | |
| Segedi Inc. | Developer | |
| Sehgel | Developer | |
| Seibu Kaihatsu | DeveloperPublisher | |
| Seibu Kaihatsu / | Publisher | |
| Seif El-Deen Soliman | Developer | |
| Seika | Publisher | |
| Seika Corporation | Publisher | |
| Seika Corporation (NA) | Publisher | |
| Sein Soft | DeveloperPublisher | |
| Sein-Soft | DeveloperPublisher | |
| SeireiART | Developer | |
| Seismic Software NA | Publisher | |
| SeismicNA | Publisher | |
| Seith CG | DeveloperPublisher | |
| SeithCG | DeveloperPublisher | |
| Seityposa | Developer | |
| Seja bem vindo ao Other Level Games | Developer | |
| Sekai Games | Publisher | |
| Sekai Project | Publisher | |
| Sekaibunka Publishing | Publisher | |
| Sekamelica | Developer | |
| Sekii | Developer | |
| Sekruis | Developer | |