| Map | Title | Author | Players | |
|---|---|---|---|---|
| DM-Underground | Underground | Battlemaster | Unknown | |
| DM-UnderGround! | UnderGround | RoMeK | Unknown | |
| DM-Underlord | Underlord | Royston 'zeromorph' Jones | 2-4 | |
| DM-UndyingShadows | UndyingShadows | Unknown | Unknown | |
| DM-UnearthlyPillar | Unearthly Pillar | Michael | 2-4 | |
| DM-UnholyGrotto | UnHoly Grotto | hilaire9 | 3-4 | |
| DM-UnrealEd | UnrealEd | Callum "Spiff" Ogden | 2 | |
| DM-UnrealsDoom2 | Orbital Station 24 | Dave Ewing | 8-12 | |
| DM-UPLogo | DM-UPLogo | Unknown | Unknown | |
| DM-Urban_Arena_2k3 | The Urban Arena 2k3 | R Stacey | 16 | |
| DM-USSCentaur | USS Centaur | Gavin "Goslin23" Goslin | 2-8 | |
| DM-UT2003Practice | UT2003 Practice | Ghetto Smack | Unknown | |
| DM-UTM-Mapathon-final | UTM-Mapathon | Bunch O Maniacs! | 10-16 | |
| DM-Uwharrie | Uwharrie | Nate "TomWithTheWeather" Overman | 4 |