M.O.A.B. is a stoner and sludge metal band from Turin, Italy, formed in 2018. They deliver crushing stoner-sludge from the Piedmont capital.

M/Eye is a southern/stoner metal act from Moscow, formed in 2023. The band channels the unexpected warmth of American-influenced stoner grooves into the Russian capital's diverse metal underground.

A stoner/doom metal act from the northern Portuguese city of Braga, Macumba has been delivering heavy, ritualistic grooves since 2015. Named after the Afro-Brazilian spiritual practice, the band channels syncretic mysticism into crushing doom.

Mad Act is a progressive stoner and sludge metal band from Amiens, France, formed in 2019. They blend progressive ambition with stoner-sludge metal's crushing, groove-laden heaviness.

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Madvro is a doom/stoner band from Smederevo, Serbia, formed in 2015 and fueled by 'beer, horror movies, books and life.' Their releases 'We Worship' and 'Invocation of High Wizard' channel slow, heavy riff worship from the Serbian underground.

Maghmata is a death 'n' roll and stoner metal band from Barcelona, Spain, formed in 2019. They blend death metal's ferocity with rock 'n' roll groove and stoner metal's fuzzy, riff-driven heaviness.

Magnetic TarTrap is a death'n'roll sludge metal band from Moscow, Russia, formed in 2009. Their 2023 album 'Overstoned' compiles ten tracks recorded in 2013 at Destroy the Humanity studios, blending heavy sludge with psychedelic stoner rock, punk, and death metal through a decade of creative output.

Mahara is a stoner and doom metal band from Sabadell, Spain, formed in 2019. They channel heavy, riff-driven doom and stoner metal through a haze of distortion and slow-burning grooves.