Part of the Choduus Brotherhood circle of Brazilian black metal, Mankindend began in dark ambient territory before pivoting to raw, Satanism- and chaos-themed black metal with a characteristically harsh and lo-fi aesthetic. The 2024 single 'Eradication,' released through Choduus, represents the project's most recent document of that abrasive later direction.

Manso Jeremías is a death/thrash metal band from Buenos Aires whose sound draws on Swedish death metal forebears such as At the Gates, Dismember, and Entombed. The band — comprising Claudio Filadoro, Martin Furia, Mariano Miranda, and Gabriel Raimondo — has released two records: DOBLEHACHA (2016) and the five-track MARABUNTA.

Manthra was a thrash/death metal band from Antofagasta, Chile, active from 2001 until their split in 2015. During their run they released two promo CD-Rs — El final (2003) and Inquisición (2004) — and later continued under the name Dark Manthra to distinguish themselves from an older Colombian band named Mantra.

Manto Negro is a groove/thrash/metalcore band from Clorinda, Formosa, formed in 2015 with a lineup of Luis Zamprogna (guitar), Ati Démön Fer (vocals), Alexis Torres (drums), and Hernán Garay (bass). The band released the EP Rockopolis Presenta a Manto Negro in 2020 and their full-length Oveja Negra in 2023.

Mantra Cornuta is an independent metal band from Medellín, Colombia, formed in 2015. The band blends traditional heavy metal with Latin influences, electronic elements, and metalcore intensity, and has released two EPs — Filth (2015) and Scorn (2018) — alongside several standalone singles.

Mantra Heavy Metal is a heavy metal band from Buenos Aires, formed in 2001 by vocalist Eduardo Paredes, guitarist Walter Sobrero, bassist Ramiro Cora, keyboardist Luis Cosenzo, and drummer Ariel Behrend. The band self-released a seven-track demo in 2003 and returned a decade later with the full-length Perder Para Ganar in 2012.

Mar de Grises was formed in Santiago, Chile in 2000, developing a death/doom sound that incorporated post-rock, ambient, and progressive elements into their dense compositional framework. Their debut The Tatterdemalion Express (2004) established them as a significant voice in South American doom, followed by Draining the Waterheart (2008) and Streams Inwards (2010), the latter named the top doom metal album of 2010 by Metal Storm's user base. The band dissolved in 2013 but announced a reunion in 2024, their catalog standing as one of the most ambitious in Latin American extreme metal.

Mar Muerto is an experimental metal band from Antofagasta, Chile, formed in 2017. Rooted in heavy metal, the band incorporates experimental touches spanning classical music, progressive structures, and black metal influences. Their 2020 EP Shub-Niggurath, a seven-track release drawing on Lovecraftian themes, stands as their primary recorded output to date.

Formed as a supergroup drawing from well-known names in the national underground, Marabô features vocalist Felipe Chehuan (formerly of Confronto and Cabeçudos), guitarist Davi Baeta, bassist Paulinho Coruja, and drummer Henrique Pucci. The band channels heavy groove and metalcore through dense riffs and politically charged lyrics, as heard on the single "Estacas," which was recorded, mixed, and mastered by Baeta and Pucci themselves.