| The Underworld | |
| Type: | studio |
| Artist: | Evildead |
| Cover: | Evildead Underworld.jpg |
| Released: | June 1991 |
| Recorded: | February–March 1991 |
| Studio: | Sound City Studios, Los Angeles, California |
| Genre: | Thrash metal, crossover thrash |
| Length: | 42:46 |
| Label: | SPV/Steamhammer |
| Producer: | Warren "King" Croyle, Juan Garcia, Evildead |
| Prev Title: | Annihilation of Civilization |
| Prev Year: | 1989 |
| Next Title: | United States of Anarchy |
| Next Year: | 2020 |
The Underworld is the second studio album by the American thrash metal band Evildead, released in June 1991 on Steamhammer Records. While the album was a mild success, it did not maintain the same popularity as Annihilation of Civilization, likely due to its release coinciding with the advent of the grunge era, which ultimately resulted in a dramatic decline in the popularity of heavy metal in general. This would be their final album with founding vocalist Phil Flores (who left in 1993) and their only featuring guitarist Dan Flores (though he would stay in Evildead until their breakup and played on their 1994 demo EP Terror), bassist Karlos Medina (who also left in 1993, although he would return in 2016) and drummer Doug Clawson (who left not long after the album was released).
Although the band had made several attempts to make a third album during early-to-mid 1990s, and again during their initial reunion from 2008 to 2012, The Underworld would be Evildead's last studio album for nearly three decades, until the release of United States of Anarchy in 2020.
All tracks by Evildead, except "He's a Woman/She's a Man" by Rudolf Schenker, Klaus Meine, Herman Rarebell