| Underkicks |
| Underking |
| UnderKor |
| Underkript |
| Underlack |
| Underlake |
| Underlandet |
| Underlay |
| Underleaf |
| Underlet |
| Underline |
| Underline the Sky |
| Underlines |
| UNDERMASK |
| Undermazk |
| Undermess |
| Undermike |
| Underminded |
| Undermine |
| UnderMobRap |
| Underneath The Gun |
| Underoath |
| Underooff |
| Underpass 134 |
| UnderRated |
| Underrated Band |
| Underrated Boy |
| Underrated Evolution |
| Underrated Forgotten & Misunderstood |
| Underrated Prodigy |
| Underrated Prodigy & Yxng Elote |
| Unders |
| Undersave |
| Underscore |
| Underscore a Cappella |
| Underscores |
| Undersided |
| Undersided, Cope |
| Underskillz |
| Underspreche |
| Understanding Death |
| Understanding Eris |
| Understandtrees |
| UNDERSTATEMENT |
| Understation |
| Undersubstance |
| Undertaker |
| Undertaker Freako |
| Undertakers |
| Undertakers Circus |
| Undertekst |
| UnderTheStairs |
| UnderTheSurface |
| Underthrow |
| Undertime |
| Undertones |
| Undertow |
| Undervention and Grant Benjamin |
| UnderVibe |
| Underwater |
| Underwater Chess Club & Teddy Roxpin & Ricky Bakken |
| Underwater City People |
| Underwater Cliffs |
| Underwater Sleeping Society |
| Underwater World Jr. |
| Underwaterkash |
| Underwaves |
| Underway Project |
| UNDERWHELMER |
| Underwhelming |
| Underwhere |
| Underwild |
| Underwing |
| Underworld |
| Underworld Assassins |
| Underworld Vampires |
| Underwrld |
| Underwurld Surfers |
| Under~Wave |
| Undex |
| Undexd |
| Undici |
| Undideu |
| Undideupeulrai |
| Undine |
| Undinyx |
| Undisclosed |
| Undisclosed Addictions |
| Undiscovered Country |
| Undissassembled |
| Undivided Band |
| Undivided Worship |
| Undo |
| Undo Sec |
| UnDOMENICO |
| Undone |
| Undone Sons |
| Undone Wrshp |
| Undötted Eyes |
| UNDOWN |
