Group
- Uncaged Anthology Team1
- Undead Presidents Press12
- Under The Mushroom21
- Under the Mushroom13
- UnderDiscussion3
- UnderDiscussion Podcast1
- UnderDiscussion: The Undergopher Podcast1
- UnderTheMushroom6
- Underdark Expedition6
- Underdark Expeditions3
- Underdog Games20
- UniGames1
- Unicorn Rampant8
- Unified Theory Games18
- Union Martial Arts65
- United States Marine Corps1
- United States Professional Mahjong League1
- Universal Battles Books RPG3
- Universal Fighting System Players Committee1
- Universal Games, Inc3