Companies
- SCEE London
- Scopely
- Seagate
- Second Dinner
- Secret Mode
- Secretlab
- SEGA
- SEGA Australia
- SEGA Corporation
- SEGA Europe
- SEGA Japan
- SEGA of America
- SEGA Sammy Holdings
- Shared Memory
- Sharkmob
- Shedworks
- Shift
- Shift Up Corporation
- Shining Rock Software
- Shiny Entertainment
- Shiro Games
- Shiro Unlimited
- Shueisha Games
- SI Games
- SIE Japan Studio