Jailbreaker is a heavy metal band from Belgium that draws on classic speed and traditional metal influences. Their energetic approach to the genre keeps the spirit of old-school European heavy metal alive in the Belgian underground scene.

Jaldaboath is a folk metal band from England signed to Napalm Records, known for their intoxicating mix of metal, Middle Ages themes, and Monty Python-esque humor. Their debut The Rise of the Heraldic Beasts (2010) features galloping drums, catchy melodies, and sarcastic lyrics delivered through Sir Jaldaboath's distinctive clean vocals in a genre they've dubbed Templar metal.

Jamie Slays is a metalcore artist from Bristol, UK, drawing inspiration from Metallica, Sylosis, and the Black Dahlia Murder. His track Thanks For The Heartache (2025) features guest performances from Josh Baines of Malevolence and Sam Kubrick of Shields, blending melodic chaos with raw emotional intensity.

Jan Magne Garte is a Norwegian multi-instrumentalist solo project from More og Romsdal, creating hard rock and power metal influenced by 1980s heavy metal. He performs all vocals and instruments himself with programmed drums, delivering albums including Fight For Life and Ghost Stories that channel classic metal energy through a distinctly Norwegian lens.

Janissary is a heavy metal band from Serbia named after the elite Ottoman military corps, delivering aggressive compositions with historical and martial themes. Their approach to metal draws on Eastern European traditions to create a distinctive, powerful sound within the Balkan metal scene.

Jawbreaker is a heavy metal band from the Netherlands whose aggressive, riff-driven approach channels the intensity of Dutch extreme music. Their compositions deliver hard-hitting metal that draws on the strong tradition of heavy music in the Low Countries.

JBP is a heavy metal band from El Prat De Llobregat, Spain, whose debut album Piel de Metal (2021) delivers nine tracks of straightforward, riff-driven heavy metal. Their Spanish-language approach to the genre brings a distinct Mediterranean flavor to classic metal songwriting.

JD Miller is a Swedish four-piece hard rock and metal band from Boras, dubbed the heaviest AOR around by Sweden Rock Magazine. Their fourth album Empyrean (2024), released through Mighty Music, features former State Of Drama guitarist Tommy Timonen and blends hard rock, metal, and AOR into a melodically driven heavy sound.

Jeddah is a heavy metal band from the United Kingdom that brings a dark, intense approach to British heavy music. Their aggressive compositions draw on the UK's deep tradition of heavy and extreme metal.