Companies
- Secret Level
- Secret Mode
- Secretlab
- See Virtual Worlds
- SEGA
- SEGA Amusements Europe
- SEGA Australia
- SEGA Corporation
- SEGA Europe
- SEGA Hardlight
- SEGA Japan
- SEGA of America
- Sega Studios Australia
- Serenity Forge
- SFB Games
- Shaba Games
- Shared Memory
- Sharkmob
- Shedworks
- Shift
- Shift Up Corporation
- Shin'en Multimedia
- Shining Rock Software
- Shiny Entertainment
- Shiny Shoe
- Shiro Games
- Shiver Games
- Shopto.net
- Showtime Networks Inc.
- Shueisha
- SI Games
- SideQuest Studios
- Sidhe Interactive
- SIE Japan Studio
- SIE Santa Monica Studio
- Sierra Entertainment
- Sierra Online
- Signal Studios
- Silicon Knights
- Silicon Studio
- Simogo
- Singularity 6
- Sixense Entertainment
- Size Five Games
- Ska Studios
- Skybound
- SkyBox Labs
- Skydance Interactive
- Skydance New Media
- Slant Six Games