Formed in Stockholm in 1994 by Nicke Andersson — then the drummer in Entombed — and Dregen of Backyard Babies, The Hellacopters began as a side project but became one of the most important Swedish rock bands of the 1990s, fusing the Detroit garage-punk of the MC5 with the riff vocabulary of AC/DC and the energy of the Ramones. Classic records including Supershitty to the Max! (1996) and By the Grace of God (2002) helped define the action rock and garage rock revival movements, and the band is considered alongside The Hives as one of Sweden's most influential rock exports. After breaking up in 2008, they reformed in 2016 and have continued releasing and performing since.

The Helldozers is a southern/groove metal/rock band from Cologne, Germany, formed in 2013. They deliver heavy, groove-laden southern metal and rock.

The Hellectric Devilz from Bayonne in the French Basque Country deliver heavy metal charged with diabolical electricity since 2020. Their portmanteau name — hell plus electric — drives compositions of hell-powered energy from the Pyrénées-Atlantiques coast.

Formed in Budapest, Hungary, in 2009 by two former members of the surf-psycho act Los Tiki Torpedoes, The Hellfreaks built their early reputation on a fusion of psychobilly and horror punk delivered with aggressive energy and dark theatrical flair. Their first two albums, Hell Sweet Hell (2010) and Circus of Shame (2012), established the project before a stylistic pivot toward harder punk rock on Astoria (2016), a move accompanied by a lineup overhaul. The band has continued releasing records, including God on the Run (2020) and Pitch Black Sunset (2023), broadening their sound while retaining the macabre imagery of their origins.

The Hidden Project from Elche in Alicante province deliver death metal from the palm-grove city of southeastern Spain since 2012. Their secretive name frames an underground approach to extreme metal from the Valencian coast.

The Hirvi is a thrash metal band from Helsinki, Finland, formed in 2018. Their name meaning "the moose" in Finnish, they deliver aggressive thrash with a uniquely Finnish identity.

The Holeum from Murcia craft post-metal and post-rock that explores vast, cavernous sonic spaces from southeastern Spain since 2016. Their name evokes a hollow, resonant void that mirrors the expansive atmospheres of their compositions.

The Hollowmen from Santa Cruz de Tenerife are among the oldest active extreme metal acts in the Canary Islands, fusing death metal with crust punk and hardcore since 1985. Four decades of output from this Atlantic island city have produced a uniquely isolated take on crossover extremity.

The Holy Flesh is a progressive black metal project from the UK, formed in 2019. Their music pushes black metal beyond its conventional boundaries through progressive song structures and experimental arrangements.