Mastic Scum are one of Austria's most internationally recognized extreme metal bands, a brutal death metal and grindcore outfit from Salzburg founded in 1992 by Harry Gandler, Man Gandler, and Linga Moser. Their sound is defined by machine-precise rhythms, dissonant riffing, and a vocal onslaught spanning guttural lows to harsh highs, and they have released six studio albums including 'ICON' on MDD Records in 2022. A seventh album is currently in production as of 2026.

Masturbory is a raw black metal and grindcore band from Helsinki, Finland, formed in 2021. They fuse raw black metal's lo-fi hostility with grindcore's explosive brevity.

A grindcore project from Italy, Mattatoio — meaning 'slaughterhouse' — has been delivering short, brutal compositions since 2015. The project channels the visceral imagery of its name into rapid-fire blasts of noise.

Matutano is a grindcore band from Bilbao, Spain, self-described as purveyors of 'grindcore snacks' — short, punchy blasts of aggression laced with crude humor. Since their 2011 debut, they have unleashed a prolific run of releases including the 'PA PAM!' series and 'DEMOLITION' (2018).

Meat Chopper In Action is a one-man old school grindcore project from Czechia by Sebastian, who also plays in Catatomb. Drawing inspiration from Agathocles, Napalm Death, and Rot, the project delivered the 2023 album 'Purgatory Begins' with Sebastian handling all instrumentation, vocals, and production.

Meatgag is a brutal death metal/goregrind band from Russia, formed in 2024. They unleash unrelenting brutal death metal fury.

MeinKraft is an experimental deathcore/grindcore/goregrind act from Zlín, Czech Republic, formed in 2021. Their sound pushes into the chaotic extremes of heavy music, blending the breakdowns of deathcore with grindcore's velocity and goregrind's visceral shock value.

Mental Case is a death metal/grindcore band from Eberswalde, Germany, active since 2010. Their sound combines death metal's brutality with grindcore's relentless velocity from the Brandenburg underground northeast of Berlin.

Messflesh is a death metal and grindcore act from Helsinki, grinding out extreme music since 2018 with a sound that prioritizes raw aggression and visceral impact. The band operates within Helsinki's diverse and well-established extreme metal underground.