Mourningside is a Swiss symphonic death metal project originally conceived in 2000 by Roman Kovalik and R.B. Broggi, finally released in 2020 after two decades. The project blends classical orchestral arrangements and choir vocals with progressive technical death metal, featuring a full ensemble of musicians pushing their compositional boundaries.

Mouthpeace is a progressive death/thrash metal band from Stockholm, Sweden, formed in 2012. They forge aggressive extreme metal at the crossroads of death and thrash.

Mpora is a death and thrash metal band from Thessaloniki, Greece, formed in 2021. They forge aggressive extreme metal from northern Greece.

Mr. Scarecrow is a Czech band from Ostrava whose 2012 debut "Change the Channel" blends power metal, death metal, and black metal across nine tracks ranging from two-minute blasts to the nine-minute epic "I've Been to the Mountaintop." The quartet of Radim Korbel, Matěj and Jakub Grunt, and Tomáš Červený later pivoted toward death metal.

MSHDR is a blackened death metal band from Yekaterinburg, Russia, formed in 2020. They forge extreme metal at the fierce intersection of black and death metal.

Muculords is a brutal death metal/goregrind band from Rimini, Italy, formed in 2005. They unleash unrelenting brutal death metal fury.

Mucupurulent is a death metal and grind 'n' roll band from Öhringen, Germany, formed in 2025. They fuse death metal brutality with grinding intensity and rock 'n' roll swagger.

A death metal and grindcore act from the Mediterranean port city of Toulon, Mucus grinds out visceral extremity since 2018. The band's deliberately repulsive name matches their commitment to the most abrasive end of extreme music.

Mudgazer is a death/sludge metal act from Einbeck in Lower Saxony, active since 2014. The band merges death metal aggression with the crushing weight of sludge.