Companies
- 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
- Slavic Magic
- Sledgehammer Games
- Sleepy Giant Entertainment
- Slightly Mad Studios
- Slipgate Ironworks
- Slitherine Software UK
- Sloclap
- SMAC Games
- small impact games
- Smilegate
- Smilegate Entertainment
- Smoking Gun Interactive
- Snail Games
- Snail Games USA
- Snappy Touch
- Snapshot Games
- SNEG
- SNK
- Snowblind Studios
- Snowman
- Sold Out
- Soleil Noir
- Something Wicked Games
- Sonic Team
- Sony
- Sony Bend
- Sony Computer Entertainment
- Sony Computer Entertainment America
- Sony Computer Entertainment Asia
- Sony Computer Entertainment Europe
- Sony Ericsson
- Sony Interactive Entertainment
- Sony London Studio
- Sony Network Entertainment
- Sony Online Entertainment