Madder Mortem	http://www.metal-archives.com/bands/Madder_Mortem/2563	Atmospheric Progressive Metal	Norway
Maglor	http://www.metal-archives.com/bands/Maglor/3540347227	Folk Metal	Canada
Magna Veritas	http://www.metal-archives.com/bands/Magna_Veritas/95943	Death/Doom Metal	Chile
Maiden Voyage	http://www.metal-archives.com/bands/Maiden_Voyage/53378	Funeral Doom Metal	United Kingdom
Majestic Downfall	http://www.metal-archives.com/bands/Majestic_Downfall/93929	Death/Doom Metal	Mexico
Mal Etre	http://www.metal-archives.com/bands/Mal_Etre/128345	Atmospheric Black Metal/Ambient	Switzerland
Maldoror	http://www.metal-archives.com/bands/Maldoror/89096	Black Metal	Italy
Malebolgia	http://www.metal-archives.com/bands/Malebolgia/15078	Brutal Death Metal	United States
Manetheren	http://www.metal-archives.com/bands/Manetheren/19308	Black Metal	United States
Mar de Grises	http://www.metal-archives.com/bands/Mar_de_Grises/6469	Melodic Doom/Death Metal	Chile
Mare Cognitum	http://www.metal-archives.com/bands/Mare_Cognitum/3540343747	Atmospheric Black Metal	United States
Martriden	http://www.metal-archives.com/bands/Martriden/77151	Death/Black Metal	United States
Mass Psychosis	http://www.metal-archives.com/bands/Mass_Psychosis/34755	Death Metal	United States
Mastodon	http://www.metal-archives.com/bands/Mastodon/1361	Progressive/Sludge Metal (early), Progressive Metal/Rock (later)	United States
Medecophobic	http://www.metal-archives.com/bands/Medecophobic/56208	Brutal Death Metal	Germany
Mehtnakriss	http://www.metal-archives.com/bands/Mehtnakriss/3540290690	Death Metal	France
Melancolia	http://www.metal-archives.com/bands/Melancolia/45372	Melodic/Dark/Black Metal	Canada
Melechesh	http://www.metal-archives.com/bands/Melechesh/424	Black/Death/Middle Eastern Folk Metal	Israel
Memory Driven	http://www.metal-archives.com/bands/Memory_Driven/3540286752	Progressive/Doom Metal	United States
Mendacity	http://www.metal-archives.com/bands/Mendacity/4596	Death Metal	United States
Mental Demise	http://www.metal-archives.com/bands/Mental_Demise/9431	Brutal Death Metal	Ukraine
Merrimack	http://www.metal-archives.com/bands/Merrimack/7714	Black Metal	France
Miasmal	http://www.metal-archives.com/bands/Miasmal/3540265816	Death Metal	Sweden
Middian	http://www.metal-archives.com/bands/Middian/86682	Sludge/Doom Metal	United States
Minhyriath	http://www.metal-archives.com/bands/Minhyriath/121670	Folk/Death Metal	Switzerland
Minotauri	http://www.metal-archives.com/bands/Minotauri/4290	Doom Metal	Finland
Minsk	http://www.metal-archives.com/bands/Minsk/28564	Doom Metal	United States
Mirror of Deception	http://www.metal-archives.com/bands/Mirror_of_Deception/3839	Doom Metal	Germany
Mirrorthrone	http://www.metal-archives.com/bands/Mirrorthrone/3485	Experimental/Atmospheric Death/Black Metal	Switzerland
Misery Machine	http://www.metal-archives.com/bands/Misery_Machine/3540276138	Melodic Doom/Death Metal	United States
Mistress of the Dead	http://www.metal-archives.com/bands/Mistress_of_the_Dead/50195	Funeral Doom Metal	Czech Republic
Mithras	http://www.metal-archives.com/bands/Mithras/6600	Experimental Brutal Death Metal	United Kingdom
Mitochondrion	http://www.metal-archives.com/bands/Mitochondrion/14732	Death/Black Metal	Canada
Monarque	http://www.metal-archives.com/bands/Monarque/51532	Black Metal	Canada
Mondstille	http://www.metal-archives.com/bands/Mondstille/128454	Avant-garde Black Metal	Austria
Mondvolland	http://www.metal-archives.com/bands/Mondvolland/3540261223	Folk/Black Metal	Netherlands
Moonknight	http://www.metal-archives.com/bands/Moonknight/3540322427	Black Metal	United States
Moonlight	http://www.metal-archives.com/bands/Moonlight/19107	Black Metal	Mexico
Moradin	http://www.metal-archives.com/bands/Moradin/3540278644	Folk/Black Metal	Canada
Mordab	http://www.metal-archives.com/bands/Mordab/3540330474	Progressive Death Metal	Iran
Morgain	http://www.metal-archives.com/bands/Morgain/4204	Folk/Doom Metal	Slovakia
Morgart	http://www.metal-archives.com/bands/Morgart/28140	Atmospheric Black Metal	Switzerland
Morning Omen	http://www.metal-archives.com/bands/Morning_Omen/3540314598	Progressive/Death/Doom Metal	Italy
Morpheus Descends	http://www.metal-archives.com/bands/Morpheus_Descends/931	Death Metal	United States
Mortis Dei	http://www.metal-archives.com/bands/Mortis_Dei/16993	Death Metal	Poland
Mother Darkness	http://www.metal-archives.com/bands/Mother_Darkness/3540328411	Atmospheric Black Metal	China
Mourn	http://www.metal-archives.com/bands/Mourn/7090	Doom Metal	United Kingdom
Mourning Beloveth	http://www.metal-archives.com/bands/Mourning_Beloveth/3928	Doom/Death Metal	Ireland
Mourning Dawn	http://www.metal-archives.com/bands/Mourning_Dawn/27495	Black/Doom Metal	France
Mourning Lenore	http://www.metal-archives.com/bands/Mourning_Lenore/3540272011	Melodic Death/Doom Metal	Portugal
Murw	http://www.metal-archives.com/bands/Murw/22648	Atmospheric Black Metal	Netherlands
Musta Kappeli	http://www.metal-archives.com/bands/Musta_Kappeli/86710	Black Metal	Finland
My Lament	http://www.metal-archives.com/bands/My_Lament/82951	Doom/Death Metal	Belgium
My Shameful	http://www.metal-archives.com/bands/My_Shameful/7978	Doom/Death Metal (early), Funeral Doom/Death Metal (later)	Finland