Mother Maddox is a groove metal and metalcore band from Madrid, Spain, formed in 2020. They fuse groove metal's rhythmic heaviness with metalcore's structural aggression.

MotherStone is a groove metal act from Rome, active since 2015. The band delivers thick, rhythmically charged compositions with a monolithic weight suggested by their name.

Motorized Tarantula is a groove metal band from Solothurn, Switzerland, whose 2015 self-titled debut delivers five tracks of thick, riff-heavy grooves with titles like "Black Widow" and "Burn My Scars." Their sound channels the mid-tempo chug and swagger of groove metal's American architects into a compact Swiss package.

Mr. Hygh is a sludge/groove metal/hardcore band from Busto Arsizio (Varese), Italy, formed in 2023. They deliver crushing, abrasive sludge metal.

Mudpusher is a death/thrash/groove metal band from Sundbyberg, Sweden, formed in 2008. They forge aggressive extreme metal at the crossroads of death and thrash.

A groove, death, and thrash metal band from Namur, Belgium, active from 2010 to 2017 as an independent act. Their lyrical focus on gore, accident, and violence placed them within the abrasive end of the Belgian extreme metal underground, combining the rhythmic punch of groove metal with death metal aggression.

Muerto en Vida is a hardcore/grindcore/crossover/thrash band from Jódar, Spain, formed by members of Cabeza de Caballo, Death Whisper my Name, and Infecto. Their self-titled release and 'El Pacto' deliver aggressive, genre-blending extremity from the Spanish underground.

Mufunta is a sludge, stoner, and groove metal act from Stoke-on-Trent, formed in 2025. The band brings heavy, riff-driven grooves to the Potteries with a sound that draws from the best of NOLA sludge and southern groove.

Mugshot is a groove metal band from Germany, formed in 2014. They channel heavy groove metal energy through crushing rhythms and aggressive vocal delivery.