| 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 | |
| Selavi Games | Developer | |
| Seldon | Developer | |
| Selectricity Productions | Developer | |
| Selectsoft | Publisher | |
| Selectsoft Publishing | Publisher | |
| Selen | DeveloperPublisher | |
| SelenJP | DeveloperPublisher | |
| SeleneVirus | Developer | |
| Selenity | Developer | |
| Selexy | Developer | |
| Self | Publisher | |
| Self Made Miracle | Developer | |
| Self-published | Publisher | |
| SelfPC | Developer | |
| Selfish Dream | Developer | |
| Selina | Developer | |
| Selkcip | Developer | |
| Seltzy | Developer | |
| Selvysus | Developer | |
| Selwes | Developer | |
| SemLaan | Developer | |
| Semaeopus | Developer | |
| Semag Games | Developer | |
| Semaphore | Developer | |
| Semenar | Developer | |
| SemiCom | Publisher | |
| SemiSinful | Developer | |
| Semicolon42 | Developer | |
| Semicom | Publisher | |
| Semisoft | Developer | |
| SemiteCoding | Developer | |
| Semmelknoedelstampfer | Developer | |
| SempiternityGMS | Developer | |
| Sen | Developer | |
| SenadMMG | Developer | |
| Senekagames | Developer | |
| Sengaya Games | Developer | |
| Senior Salvador | Developer | |
| Senior-X | Developer | |
| Sennari Interactive | Developer | |
| Sennin | Developer | |
| Sense Games | Developer | |
| Sense_101 | Developer | |
| SenseiSquishy | Developer | |
| Sensen Games | Developer | |
| Sensible Software | DeveloperPublisher | |
| Sensible Software (Richard Joseph) | Developer | |
| Sensory Sweep | Developer | |
| Sensory Sweep Studios | Developer | |
| Sensui Software | Developer | |
| Sente Systems | Publisher | |
| Sentient Software | Developer | |
| Sentient Software (Andrew Postlewhite, Clive Paul, Jonathan Dunn) | Developer | |
| Sentient Software (Andrew Postlewhite, Robert Moneagle, Ben Daglish) | Developer | |
| Sentient Software (Elliot Gay, Allistair Watt) | Developer | |
| Sentient Software (John Mullins, Clive Paul, Mark R. Jones, Peter Clarke) | Developer | |
| Sentient Software (John Mullins, Clive Paul, T Fagelman) | Developer | |
| Sentient Software (John Mullins, Robert Moneagle, Flora Stoneman, Clive Paul, Alick Morrall) | Developer | |
| Sentient Software (Mark Kirkby, Robert Moneagle, Flora Stoneman, Clive Paul, Alick Morrall, Dawn Drake) | Developer | |
| Sentient Software (Michael Berlyn & Harry Walker) | Developer | |
| Sentient Software (Mike Lamb, Jonathan Dunn, Bill Harbison, John Mullins, Alick Morrall) | Developer | |
| Sentient Software Ltd. | Publisher | |
| Sentrigan | Developer | |
| SentryTurbo | Developer | |
| Senydesu | Developer | |
| Senzouz | Developer | |
| Seongwoon | Developer | |
| Seph Boss | Developer | |
| Sephta | Developer | |
| Sepi | Developer | |
| Sepia Mage | Developer | |
| SepiaGames | Developer | |
| Seppi-gamestudios | Developer | |
| SeprAY | Developer | |
| SepulvedaJoshua | Developer | |
| SeracStudio | Developer | |
| Serafín Álvarez | Developer | |
| Seraph Team | Developer | |
| SeraphCircle | Developer | |
| SeraphInSolace | Developer | |
| SeraphinaKitten | Developer | |
| Seraphinite | Developer | |
| Serdetay | Developer | |
| Serellan | Developer | |
| Serena Samborski | Developer | |
| Serenaagh | Developer | |
| Serenadev | Developer | |
| Serendevity | Developer | |
| Serendipity Software | DeveloperPublisher | |
| Serendipy Studios | Developer | |
| Serene | DeveloperPublisher | |
| Serenity Forge | DeveloperPublisher | |
| SergFras | Developer | |
| Serge Dosang | Developer | |
| Sergei Ryzhkov | Developer | |
| Sergent Cule | Developer | |
| Sergenti | Developer | |
| Sergey | Developer | |
| Sergey Lerg | Developer | |
| Sergey Noskov | Developer | |