Mandaground are a metalcore band from Weiz, Styria, formed in 2017 and signed to Grazil Records. Their self-titled debut was recorded at their rehearsal space in the Turm Weiz building, and they describe their approach as experimental metal alongside their metalcore foundation. The band is one of the more active acts on the Styrian underground metal circuit.

Manfrea is a blackened death metal (early); metalcore (later) band from Moscow, Russia, formed in 2016. They forge extreme metal at the fierce intersection of black and death metal.

A metalcore act from the Upper Silesian city of Chorzów, Manroy has been delivering breakdown-heavy compositions since 2018. The band operates within the densely populated Silesian metal underground.

Mantrum is a melodic death/thrash metal band from northern Germany, with releases spanning from their 2012 self-titled debut through 2018's "The Age of Vultures." Their sound fuses groove-oriented rhythms with progressive and thrash metal elements, driven by Hermann von Ohr's compositions and Wasili M.'s lyrics.

March of Scylla is a metalcore act from Amiens in northern France, formed in 2023 with a sound that balances crushing breakdowns with melodic hooks. The band brings modern metalcore energy to Picardy's underground music scene.

Marobaki is a progressive metalcore band from Edinburgh, Scotland, formed in 2018. They push metalcore into progressive territory with intricate compositions.

Mask of Prospero is a progressive metal band from Athens, Greece, formed in 2018, having evolved into progressive metalcore and djent. Their creative evolution reflects an embrace of modern progressive metal's rhythmic complexity.

Mass Hypnosis is a band from Zagreb, Croatia, formed in 2014, having evolved from metalcore and melodic death metal into industrial, groove, and nu-metal. Their stylistic evolution reflects an adventurous creative journey across heavy music styles.

Massacre of the Megafauna is a stoner, thrash metal, and metalcore band from Sheffield, England, formed in 2010. They deliver a chaotic blend of stoner metal, thrash, and metalcore from the Steel City.