Formed in London, England in 2007, Hang the Bastard operated at the intersection of sludge metal, doom, and metalcore, releasing Hellfire Reign (2010) and Sex in the Seventh Circle (2014) on Century Media Records. Their churning, downtuned riffs and hardcore-inflected aggression placed them alongside the British heavy underground scene of the late 2000s. The band disbanded in 2016 following a farewell performance at the Damnation Festival but subsequently reunited.

Hanga is a sludge metal/crust punk band from Bethmale, France, active since 2014 and delivering crushing, suffocating heaviness from the low end. The project channels the abrasive, punishing weight of sludge metal.

Hariessa is a doom/sludge/stoner metal band from Athens, Greece, active since 2023 and delivering crushing, fuzz-laden heaviness where doom's oppressive weight meets stoner metal's hazy grooves. The project channels low-end power and psychedelic atmosphere.

Forged in Swansea's metal community, this sludge/stoner metal/rock act channels dark aggression since 2014. Their work contributes a distinctive voice to their regional underground scene.

Metal band from Kokkola, Finland, with Finnish-language releases including "Missa Mieli Pakenee Ruumiista" and the self-titled album. Their catalog of darkly titled compositions reflects an introspective approach to heavy music from Finland's western coast.

Hashbreath is a sludge/stoner/doom metal band from Malmö, Sweden, active since 2013 and delivering crushing, fuzz-laden heaviness where doom's oppressive weight meets stoner metal's hazy grooves. The project channels low-end power and psychedelic atmosphere.

Hashmaker is a groove/stoner/sludge metal band from Cork, Ireland, active since 2021 and delivering fuzz-laden, groove-heavy riffs through a haze of overdriven amplification. The project channels the riff-worshipping spirit of the genre.

Hatespace is a sludge metal band from Drogheda, Ireland, active since 2020 and delivering crushing, suffocating heaviness from the low end. The project channels the abrasive, punishing weight of sludge metal.

From Budapest in Hungary, this southern/sludge metal act brings relentless intensity to the regional scene since 2009. Energetic performances and committed songwriting define their approach.