Eternal Nightmare is the debut album by the San Francisco Bay Area thrash metal band Vio-lence. It was released on June 27, 1988 through MCA Records' Mechanic sublabel. A limited 10" promo single was released, featuring two tracks, 'Eternal Nightmare' and 'Phobophobia.'; the release was quite unique, as it came in a "vomit pack", a sealed plastic cover containing fake vomit. Shortly after, thrash metal innovators Slayer released a single in a similar format but with fake blood, and rock band The Revolting Cocks released a single with fake semen.
The 2005 re-release of the album includes a bonus CD of the Thrash of the Titans concert (benefit for Testament singer Chuck Billy), recorded August 11, 2001. As of 2023, other than the EPs Torture Tactics and Let the World Burn, this is the only Vio-lence studio album to have been made available on digital streaming services.