- Mass (USA) (Heavy Metal-USA)
- Mass Brutality (Death Grind-Portugal)
- Mass Burial (ESP) (Death Metal-Spain)
- Mass Burial (AUS) (Brutal Death Black-Australia)
- Mass Casualty (Death Metal-USA)
- Mass Casualty Incident (Death Metal-Germany) - Other name : MCI
- Mass Coma (Grindcore-United-Kingdom) - Other name : Masscoma
- Mass Confusion (Thrash Metal-Bulgaria)
- Mass Cremation (Thrash Metal-Bulgaria)
- Mass Culture (Experimental Metal-Greece)
- Mass Damnation (Death Thrash-Sri-Lanka)
- MDD (Crust-Mexico) - Other name : Mass Death And Destruction
- Mass Deception (Thrash Metal-Netherlands) - Other name : MD
- Mass Defect (Thrash Death-Philippines)
- Mass Destruction (Thrash Metal-Colombia)
- Mass Disorder (Thrash Metal-Portugal)
- Mass Execution (ITA) (Thrash Metal-Italy)
- Mass Execution (BRA) (Death Metal-Brazil)
- Mass Extinction (Thrash Speed-Ireland)
- Mass For Chatter (Deathcore-Bosnia and Herzegovina) - Other name : MFC
- Genocide (USA-2) (Heavy Metal-USA) - Other name : Mass Genocide
- Mass Genocide Process (Crust-Czechia) - Other name : MGP
- Mass (GER-1) (Stoner-Germany)
- Mass (GER-2) (Heavy Metal-Germany)
- Mass Grave (FRA) (Death Metal-France)
- Mass Grave (BGR) (Death Grind-Bulgaria)
- Grave Syndrome (Brutal Death-USA) - Other name : ex-Ominous Reminiscence, ex-Mass Grave Syndrome
- Mass Hypnosia (Thrash Death-Philippines)
- Mass Hypnosis (Death Metal-Croatia)
- Mass Hysteria (Fusion-France) - Other name : MH
- Mass In Comatose (Death Metal-Estonia)
- Mass Infection (Technical Death-Greece)
- Mass Insanity (Death Metal-Poland)
- Mass Kontrol Genocide (Black Metal-Japan)
- Mass Madness (Death Thrash-Russia)
- Mass Massacre (Brutal Death-Ukraine)
- Mass Mental (Fusion-USA)
- Mass Mortality (Melodic Death-Russia)
- Mass Murder (Brutal Death-Italy)
- Mass Murder Agenda (Industrial Metal-Sweden)
- Mass Murder Frenzy (Death Metal-USA)
- Mass Murder Machine (Death Thrash-Germany)
- Mass Murder Messiah (CAN) (Death'n'Roll-Canada) - Other name : MMM
- Mass Murder Messiah (USA) (Brutal Death-USA)
- Mass Murder Phenomena (Death Metal-USA) - Other name : MMP
- Mass Murderers (Hardcore-France)
- Mass Obliteration (Death Metal-Italy)
- Mass Of Shit (Grindcore-Brazil)
- Mass Of Virtue (Progressive Metal-USA) - Other name : MOV
- Mass Produced Human (Grindcore-USA) - Other name : MxPxHx
- Mass Psychosis (Death Metal-USA)
- Mass Separation (Grindcore-Malaysia)
- Mass Slaughter (Death Metal-Italy)
- Mass Worship (Death Dark-Sweden)
- Massacaust (Thrash Metal-USA)
- Massacra (Death Metal-France)
- Massacra Noise (Death Grind-Belgium)
- Massacration (Heavy Metal-Brazil)
- Massacrator (MEX) (Thrash Metal-Mexico)
- Massacrator (ITA) (Black Metal-Italy)
- Massacre (USA) (Death Metal-USA)
- Massacre (CAN) (Thrash Metal-Canada)
- Massacre (CR) (Death Metal-Costa-Rica)
- Enforce (POR) (Thrash Speed-Portugal) - Other name : ex-Massacre
- Massakre (Thrash Metal-Chile) - Other name : Massacre
- Massacre At The Bikini Bottom (Porno Gore Grind-Guatemala) - Other name : MATBB
- Massacre Bestial (Thrash Metal-Brazil)
- Massacre By Fall (Screamo-Malaysia)
- Massacre Conspiracy (Metalcore-Malaysia) - Other name : MC16
- Massacre Divino (Dark Ambient-Portugal)
- Massacre DLL32 (Brutal Death-Brazil)
- Massacre Em Alphaville (Crust-Brazil) - Other name : MEA
- Massacre Of Innocence (Metalcore-Australia)
- Massacre Of Mothman (Deathcore-China)
- Massacre Of The Umbilical Cord (Deathcore-USA)
- Massacre On Privet Drive (Deathcore-United-Kingdom)
- Massacre On The Fjords (Progressive Death-United-Kingdom)
- Massacred (Death Grind-Argentina)
- Massaker (Thrash Metal-Brazil)
- Massakergore (Grindcore-Italy)
- Starkill (Melodic Death Black-USA) - Other name : ex-Ballistika, ex-Massakren
- Massappeal (Crossover-Australia)
- Massault (Death Thrash-France)
- Massay (Melodic Metal-Brazil)
- Massdistraction (Thrash Metal-Sweden)
- Massemord (NOR) (Black Metal-Norway)
- MasseMord (PL) (Black Metal-Poland)
- Massen (Symphonic Death Black-Belarus)
- Massenhinrichtung (Black Metal-Belarus)
- Massensterben (Black Metal-Germany)
- Masseporz (Black Metal-Italy)
- Massface (Alternative Metal-Russia) - Other name : ex-CodeRed
- Massgrav (SWE) (Hardcore-Sweden)
- Massgrav (Death Metal-Sweden)
- Massgrave (CAN) (Crust-Canada)
- Massgrave (Death Metal-Germany)
- Massground (Brutal Death-Japan)
- Massif (Heavy Metal-Belgium)
- Massive (AUS) (Hard Rock-Australia)
- Massive (SGP) (Black Metal-Singapore)
- Massive Assault (Death Metal-Netherlands)
- MAD (FRA) (Hard Rock-France) - Other name : Massive Audio Distorsion
- MAN (Nu Metal-Sweden) - Other name : Massive Audio Nerve
- Massive Bereavement (Drone-United-Kingdom)
- Massive Blast (Thrash Metal-Italy)
- Massive Bleeding (Brutal Death-Mexico)
- Massive Carnage (Death Metal-Portugal)
- Massive Charge (Grindcore-France)
- Massive Cock (Metalcore-Belgium)
- Massive Demolition (Thrash Metal-Germany)
- Massive Destruction (Industrial Metal-Panamá)
- Massive Destruktion (Thrash Metal-Puerto-Rico)
- Massive Euthanasia (Death Metal-Colombia)
- Massive Execution (Thrash Metal-Paraguay)
- Massive Fire (Heavy Metal-Brazil)
- Massive Obliteration (Death Grind-France)
- Massive Punch (Melodic Heavy-Germany)
- Massive Repulsive (Deathcore-USA)
- Massive Retaliation (Black Death-USA)
- Massive Roar (Thrash Metal-Portugal)
- Massive Scar Era (Post Hardcore-Egypt) - Other name : Mascara, MSE
- Massive Self Killing (Death Metal-France)
- Massive Slavery (Death Metal-Canada)
- Massive Sound Of Disorder (Progressive Metal-Portugal) - Other name : MSOD
- Masskill (Thrash Metal-Brazil)
- Massless (Metal-United-Kingdom)
- Future Ruins (Crust-Sweden) - Other name : ex-Massmord
- Massmurder (SWE) (Black Metal-Sweden)
- Massmurder (NL) (Brutal Death-Netherlands)
