| 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 | |