Umbrtka is a metal band from Plzeň, Czech Republic. The band describe their music, which incorporates black, doom, industrial metal elements and is influenced by Czech underground, as 'grey' metal. The main themes of their lyrics are deserted industrial areas, factories, power plants, railways, dirty streets, trains, and other industrial elements.
'Umbrtka' is a name for a 'deity' which rules the grey industrial world. It is based on a working-class man called Ivo Krátký, formerly employed in Skart, Plzeň's scrapyard which, within the band's lyrics, is considered a 'temple of labor'.