Mastroyany is a death metal (early); hardcore/thrash metal (later) band from Ryžoviště, Czech Republic, formed in 2019. They forge aggressive extreme metal at the crossroads of death and thrash.

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.

Masugn is a death/thrash/black metal band from Gothenburg, Sweden, formed in 2015. They forge extreme metal at the fierce intersection of black and death metal.

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.

A thrash/death metal band from the Madrid suburb of Torrejón de Ardoz, Matadero — Spanish for 'slaughterhouse' — delivers exactly the kind of visceral aggression the name promises. Formed in 2016, they combine Bay Area thrash velocity with death metal heaviness.

Matanuska is a heavy and groove metal act from the Scottish city of Aberdeen, delivering thick, riff-heavy compositions since 2014. The band brings a muscular groove metal approach to Scotland's granite city.

Matar is a black metal band from Pirkanmaa, Finland, formed in 2024. They channel cold, dark black metal from the Finnish interior.

Founded in Ghent in 2021 by two mid-40s metal enthusiasts and a younger drummer, Matavitatau write and perform all their black metal exclusively in Latin, drawing lyrical content from Roman poets such as Horace, Seneca, and Lucan as well as medieval authors Egbert of Liège and Bernard of Cluny. Their 2025 debut demo Numen Nescio, released on Italian label Canti Eretici Productions, drew comparisons to Mayhem's De Mysteriis Dom Sathanas for its raw atmosphere and dynamic precision.

Mater Tenebra is a black metal project from Vicenza in the Veneto, active since 2020. The project channels the 'mother of darkness' imagery into atmospheric, ritualistic black metal.