| Ukuza | DeveloperPublisher | |
| Ulicon | Developer | |
| Ulises Freitas | Developer | |
| Ullucus Heaven | DeveloperPublisher | |
| UltDev | Developer | |
| Ultimapwn | Developer | |
| Ultimate Bounce 84 | Developer | |
| Ultimate Games | DeveloperPublisher | |
| Ultimate Play The Game | Publisher | |
| Ultimate Play the Game | DeveloperPublisher | |
| Ultimate Play the Game (U.K.) | Publisher | |
| Ultimate750 | Developer | |
| UltimateWalrus | Developer | |
| Ultimately | Developer | |
| Ultimateum | Developer | |
| Ultimation Inc. | Developer | |
| UltimoGames | Developer | |
| Ultizen Games | Developer | |
| Ultizero | Publisher | |
| Ultra X | Developer | |
| Ultra Dolphin Revolution | DeveloperPublisher | |
| Ultra Games | Publisher | |
| Ultra Games NA | Publisher | |
| Ultra Graphix | Developer | |
| Ultra Runaway Games | Developer | |
| Ultra Shenanigans | Developer | |
| Ultra Software Corporation | Publisher | |
| Ultra Ultra | DeveloperPublisher | |
| UltraBot | Developer | |
| UltraCoolHand | Developer | |
| UltraDwagon | Developer | |
| UltraRat | Developer | |
| UltraVioletGames | Developer | |
| Ultrabanaman | Developer | |
| Ultrakupra | Developer | |
| Ultrasoft | Developer | |
| Ultravioleta | Developer | |
| Ulvhamr | Developer | |
| Ulvra | Developer | |
| Ulydev | Developer | |
| Uma Tenshi | Developer | |
| Umaiki Games | DeveloperPublisher | |
| Umbra | Developer | |
| Umbra Games | Developer | |
| Umbral Knights | Developer | |
| Umbu Games | Developer | |
| Umby Pokochan | Developer | |
| Umiloo Studios | Developer | |
| UminoAoi | Developer | |
| Umitsuki Production | DeveloperPublisher | |