Magzilla was a doom, stoner, and sludge metal band from São Paulo, Brazil, active from 2013 until splitting up in 2017. The quartet — featuring Guilherme Foresti on vocals and guitar, Pedro Alves on guitar, Joe Borges on bass, and Leandro Furini on drums — released two records: The Oath in March 2016 and a self-titled album in July 2017.

Mahanvhantara was a black metal band from Aracaju, Sergipe, Brazil, formed in 2007 with lyrical themes rooted in Thelema, Ophiolatry, and Gnostic Luciferianism. The band released the demo O Decantar dos Dragões Decaídos in July 2007, recorded at Cathal Dallan Home Studio in Aracaju, and later returned with the album Dissolutionem - Finis Coronat Opus in September 2018, released through Black Hearts Records.

Makabro is a heavy/thrash/power metal band from Villa Regina, Río Negro, formed in 2014 and active in Argentina's Patagonian underground scene. The band self-released a six-track studio EP in 2022, available on Spotify as "Full EP Estudio 2022", documenting their progressive thrash sound.

Maktub is a Brutal Death Metal and Grindcore band from Monterrey, Nuevo León, Mexico, formed in 2025 and signed to SBDC Records. The band released their self-titled debut EP in August 2025, a nine-track record distributed digitally through Bandcamp.

Malacara is a veteran Buenos Aires heavy metal band with two albums listed on the Metal Archives: "Vuelvo a tu camino" and "Mi rebelión". The band appeared on the 2006 Argentine tribute compilation "El Barón Vuela Sobre Argentina — Tributo a Barón Rojo", contributing a cover alongside bands such as Riff and Lethal.

A ritualistic project fusing black metal ferocity with the suffocating weight of doom, Malaise Shire conjures dense atmospheres rooted in darkness and despair. Their 2022 release "Painful Ritual of Despair" showcases a brooding blend of tortured riffs and ceremonial dread, recorded entirely in Paraíba.

Malakay was a black metal band from the interior of Minas Gerais whose approach leaned toward raw, uncompromising aggression. The band left behind recordings including the demo "Radicalism or Die" and the cassette album "The Edge Garden" before splitting up.

Malaria is a thrash metal and crossover band from Merlo, Buenos Aires, operating in the tradition of aggressive street-level metal with lyrical themes spanning war, social commentary, and the mosh pit. The band has self-released multiple recordings on Bandcamp, including a three-track demo (2016), the eight-track "Future Decimation EP" (2017), and the two-track "Piss Tape" (2018).

A nascent black metal project out of Rio de Janeiro, Malatanya emerged in 2024 with an outlook rooted in orthodox darkness and ominous atmosphere. Still in their early stages, the band channels the malevolent energy of the city's underground extreme metal scene.