Marooned is a death-thrash metal band from Wollerau, Switzerland, formed in 2013 that fuses the technical aggression of thrash with the heaviness and guttural vocal approach of death metal. Their sound draws on the rich tradition of Swiss extreme metal while carving out their own space within the country's underground scene.

Marraskuun Lapset is a gothic and melodic death metal band from Vaasa, Finland, formed in 2021. Their Finnish-language name meaning "November's Children" captures their blend of gothic melancholy and melodic death metal aggression.

Marterzid is a death 'n' roll/crust punk band from Berlin, Germany, whose 2025 rehearsal-room demo introduces a four-piece delivering German-language vocals over a raw hybrid of death metal weight, hardcore intensity, and punk urgency. Their sound blends provocative, dystopian themes with aggressive crossover instrumentation.

Martin and the Vampires is a brutal death metal and grindcore act from Sundbyberg in the Stockholm metropolitan area, active since 2018. The band channels B-movie horror themes into visceral, blast-driven extremity.

Martvl Nighty Ravenheart is a death/black/thrash metal band from Eiterfeld, Germany, formed in 2021. They forge extreme metal at the fierce intersection of black and death metal.

Martyr Defiled was a deathcore act from Lincoln, active since 2009 and one of the UK's most prominent bands in the genre. The band delivered ferocious, breakdown-heavy extremity that helped define the British deathcore sound alongside acts like Ingested.

Martyrdoom is a death/doom metal band from Warsaw, Poland, formed in 2017. They craft crushing doom-death compositions steeped in oppressive heaviness.

Martyrion is a melodic death metal band from Cologne, Germany, founded in 2006, whose music is set in a dystopian 2153 scenario of civilizational collapse. Their releases "Our Dystopia" and "Gaia Uprising" blend catchy melodies, powerful solos, and atmospheric storytelling into a conceptually ambitious take on melodic death metal.

Marvinz Troma is a blackened death metal project from Rennes, emerging in 2023 with a name that nods to the B-movie horror studio Troma Entertainment. The project channels that same low-budget, gore-soaked aesthetic into extreme metal.