Jesu is the acclaimed project of Justin K Broadrick, founder of industrial metal pioneers Godflesh, blending dreampop, ambient, shoegaze, and metal since 2003. Based in the UK, the project has released a vast catalogue including Heart Ache, Terminus, and Every Day I Get Closer To The Light From Which I Came, redefining the boundaries between heaviness and ethereal beauty.

Jizz Witch is a heavy experimental metal project from Groningen, Netherlands, blending funeral doom, sludge, stoner rock, and space rock into psychedelic heaviness. Their instrumental releases including Doomonomicon (2017) and Bongzord deliver extended, fuzzed-out compositions drenched in cosmic doom atmospherics.

John the Baptist is a doom metal band from Jyvaskyla, Finland, whose slow-burning, heavy compositions channel the crushing weight of traditional doom. Their releases including A Glimpse of Valor showcase the Finnish penchant for heavy, soul-crushing riff worship.

Johnny the Boy formed in the United Kingdom in 2014, built around a creative core of vocalist Belinda Kordic and guitarist Justin Greaves, both key members of Crippled Black Phoenix, alongside bassist Matt Crawford. Signed to Season of Mist, the band blends blackened sludge, doom, and hard rock into a sound described as ice-cold black metal meeting excoriating sludge metal.

Jointhugger is a Norwegian heavy psychedelic doom rock band active since 2012, self-described as hashtronauts of the heavy playing cosmic, psychosonic doom rock straight from the fjords. Their trilogy of albums including Surrounded By Vultures (2021), composed by Nico Munkvold and recorded live at Stone Bone Cross Studio, channels deep fuzz and occult heaviness.

Jonny Vinter and the Gloominess is a Swedish rock and metal band from Nykoping, rocking since 1989 in a modern rock/metal/gothic rock-metal fusion. Their extensive discography explores the dark and light inside us through albums including It's Alive, All is Doom & Black, and The Dark Side of a Motel.

Jorum is a dark metal and hard rock band from Gothenburg, Sweden, established in 2023 and expressing darkness through heavy atmospheric compositions. Their debut album Vortex Of Madness (2025) features ten tracks spanning heavy metal, black metal, doom, and gothic rock, available on both digital and vinyl formats.

Jouissance Morbide is a black metal band from Marseille, France, whose album Sublimation (2022) was recorded at Daemonicreation Studio. Their four-track release channels the raw intensity of French black metal through extended compositions including the eight-minute Sheol and Le ciel est mort.

Jumalhauta is a Finnish death metal band from Ylivieska whose releases including Yhdeksan Sairautta and Kuolinvirsi deliver crushing Scandinavian death metal. Their Finnish-language lyrics and raw approach to the genre place them firmly within the lineage of Finland's storied death metal tradition.