25 wads
| File | Name | Author | Iwad | Demos | Length |
|---|---|---|---|---|---|
| undertow | undertow | Gregory Dick | doom2 | 2 | 18:22 |
| undrfire | Under Fire for Doom 2 | Jeff Cruser | doom2 | 3 | 3:49 |
| undrseig | undrseig | Gene Spinks | doom2 | 1 | 2:07 |
| unfun | unfun | Adrian Roselli | doom | 4 | 3:07 |
| unhallowed | Unhallowed | CyanoBlugron | doom2 | 1 | 30:11 |
| unisin | unisin | Merlin of Pleth | doom2 | 6 | 1:42 |
| unknown | unknown | Dutch Devil | doom2 | 2 | 15:59 |
| unnamed | unnamed | Mr. Chris | doom2 | 1 | 9:12 |
| unrattled | UNRATTLED | Various | doom | 12 | 1:05:12 |
| unttld | Untitled | Thelokk | doom2 | 1 | 5:01 |
| unwisdom | Castle of Unwisdom | Ittaanip | doom2 | 1 | 2:25 |
| upliftng | upliftng | Bart Wilson | doom | 3 | 11:46 |
| uplink15 | uplink15 | Zoltan Schmidt | doom2 | 4 | 13:56 |
| upr | Unia Polityki Realnej WAD | Krzysztof Niekrasz | doom2 | 1 | 5:04 |
| uprising | Uprising | Cheesewheel | doom2 | 20 | 58:21 |
| ur | Unholy Realms | Various | doom2 | 227 | 9:05:59 |
| urania | urania | riderr3 | plutonia | 32 | 7:20:12 |
| urbanfr | urbanfr | ProcessingControl | doom2 | 1 | 9:35 |
| urbanside | URBAN SIDE | NoC0ncentrate51 | doom2 | 7 | 21:56 |
| urbnbeta | urbnbeta | Frederick Bradley & Robert Bradley & Ryan Louie | doom | 7 | 6:08 |
| urlove | Give Me All Your Love | dashiefrickintyan | doom2 | 3 | 12:11 |
| uroboros | Uroboros | Ravendesk | doom2 | 9 | 1:05:09 |
| utopia | utopia | Scott | doom | 2 | 8:13 |
| uuhhtod | uuuhhhtod | TimeOfDeath | doom2 | 1 | 3:23 |
| uwhotel | uwhotel | Ken Taggard | doom | 2 | 1:35 |