Massaluca is a melodic death metal and metalcore band from Madrid, Spain, formed in 2024. They blend Scandinavian-influenced melodic death metal with metalcore's structural dynamics.

Maszyna is a hard rock, groove metal, and metalcore act from the southeastern Polish town of Kraśnik, active since 2013. The band's Polish name, meaning 'machine,' reflects their mechanical, driving approach.

Mein Kopf ist ein brutaler Ort is a groove metal and metalcore act from Frankfurt am Main whose name translates to 'My Head Is a Brutal Place.' Active since 2013, the band channels psychological intensity into heavy, rhythmically charged compositions.

Mekaora is a metalcore act from Rambouillet in the Île-de-France region, active since 2013. The band blends heavy breakdowns with melodic passages, contributing to the French metalcore scene from the forested outskirts of greater Paris.

Mekonium is a death'n'roll band from Bern, Switzerland, established in 2000 and featuring Phibe on bass and vocals, Avi on drums, Val and Harry on guitars. Self-described as delivering 'asskicking and earfucking old school death'n'roll,' their albums 'After The Last Day' and 'Bastard' channel raw, groove-laden heaviness with a punk-infused swagger.

Memorial of Sorrow is a groove metal and metalcore band from Omsk, Russia, exploring 'the toxicity of existence' through Russian-language lyrics. Their 2020 debut 'Memorable' delivers six tracks of heavy, groove-oriented metal with ambient soundscapes and deeply melancholic themes of depression and despair.

Memories in Torment is a groove metal and metalcore band from Guildford, England, formed in 2013. They blend groove metal's rhythmic power with metalcore's aggressive dynamics.

Mental Defect is a female-fronted melodic death metal/metalcore band from Leipzig, Germany, led by vocalist Clodi Korzin. Their evolution from dark-melancholic origins toward "low pitches, rough style and massively powerful" heaviness marks a deliberate reinvention of their sound.

Mentally Ill is a melodic death/thrash metal and metalcore band from Frankfurt, Germany, active since 2015. Their sound bridges the aggression of Scandinavian-influenced melodic death metal with thrash and metalcore elements from one of Germany's largest cities.