Anatomy Corruption is a death/stoner metal band from Mundo Novo, Bahia, Brazil, formed in 2018. The band occupies an unusual niche, blending the psychedelic, riff-heavy groove of stoner metal with death metal aggression — a combination that sets them apart from the standard extreme metal output of Brazil's northeast.

Ancestral Terror is a death/thrash metal band from Catalão, Goiás, rooted in the old-school extreme metal tradition with lyrical themes of religious corruption, war, and iconoclasm. The band issued their debut recording Hallways of Pain and later appeared on the 2016 split Bacchanals of Horror alongside Rio de Janeiro act Orgy of Flies through Warhemic Productions. They have been on hold since around 2013.

Ancienterror is a death/thrash metal band from Santiago, Chile, formed in 2002 from the ashes of Missing Sequence, and has remained active in the city's underground scene ever since. The band released the EP "Arguments for Aggression" in 2007 and has built its lyrical identity around anti-religious, anti-globalization, and anti-capitalist themes.

Ancillae is a death/thrash metal band from Carazinho, Rio Grande do Sul, Brazil, formed in 2024. A recent entry into the Brazilian extreme metal underground, they combine the brutality of death metal with the aggression and riff-driven attack of thrash.

Anger Cult was a death/thrash metal band from Jaraguá do Sul, Santa Catarina, Brazil, active from 2017 until splitting up. They released an EP titled "Bringing Order Through Chaos" in 2017, delivering aggressive, riff-driven extreme metal in the tradition of Brazil's underground death-thrash scene.

Anhaguama is a death/black metal band from Arujá, São Paulo, Brazil, formed in 2019 and operating in the underground extreme metal scene of greater São Paulo. Their music draws from the aggressive intersection of death and black metal, a tradition with deep roots in Brazil's extreme metal history.

A death/thrash metal band from Rio de Janeiro with roots stretching back to the mid-1980s underground scene, founded by guitarist Alberto "Urubu" Lemos. The band built a reputation through raw demo recordings and aggressive live performances before releasing their 1997 album "Fate" on Kaos Records, which drew attention from the worldwide underground circuit. Their sound draws on the hard-edged Brazilian thrash tradition, with lyrical themes centered on war, societal collapse, and political decay.

Antagonyze is a death metal band from the Bio Bio region of Chile, founded by guitarists Ignacio Riveros and Francisco Álvarez and bassist Mateo Gutiérrez. The band released the demo cassette Echoes from Soul in 2020 and later re-recorded and expanded that material into their debut full-length Interpretations of the Unknown Wilderness, released in April 2024 on Chaos Records. The album was recorded at Estudio Chains in Los Ángeles, Chile, and drew praise for its old-school 1990s death metal approach with thrashing, prog-inflected intensity.

Antropofectus is a death/black metal project from Magé, in the Baixada Fluminense region of Rio de Janeiro state, Brazil, formed in 2021 and currently on hold. Blending the aggressive tremolo-heavy assault of black metal with the low-end brutality of death metal, the project is part of Rio de Janeiro's active underground extreme metal network. They released music independently through Bandcamp.