Mangled Demos from 1983 is a collection of various early Melvins recordings from 1983, remastered and released on Ipecac in 2005. Until 2005, none of the material, with the exception of the first version of "Forgotten Principles", had ever been officially released. A few tracks included in this album have previously appeared on bootleg releases. It is the only record featuring the original lineup (Buzz Osborne/Matt Lukin/Mike Dillard). Tracks 3-13 were recorded at Mud Bay, a suburb of Olympia, Washington, for possible album release. Ultimately the album was not released at the time, as no record label was interested in the Melvins until 1985.
The vinyl version of Mangled Demos From 1983 was released on Alternative Tentacles as a double 10" record. Notably, it features a small booklet hidden amongst the vinyl with liner notes by Buzz Osborne detailing life in Washington around 1983 with almost no details on the actual record or recording itself, done in a similar fashion to the liner notes in 26 Songs and Gluey Porch Treatments. The last two tracks (Both of which being short silent tracks) are omitted from the vinyl release.