Companies
- WWE
- X (formerly Twitter)
- Xaviant
- Xbox Game Studios
- XD
- Xfire
- XGen Studios
- XLGAMES
- XS Games
- XSEED Games
- Yacht Club Games
- YAGER Development
- YAHOO
- Yingpei Games
- Yorkshire Tea
- Young Horses, Inc.
- YouTube
- YoYo Games
- Ys Net
- Ysbryd Games
- Yuke's
- Yukikaze
- ZA/UM
- ZEAL Game Studio
- Zeboyd Games
- Zen Studios
- zen united
- ZeniMax Media
- ZeniMax Online Studios
- Ziggurat Interactive
- Zindagi Games
- Zipper Interactive
- Zoe Mode
- Zoink! Games
- Zombie Cow Studios
- Zombie Studios
- Zoo Digital
- Zootfly
- Zynga