Azator is a Buenos Aires blackened thrash metal band whose lineup has included guitarist and vocalist Facundo Batista alongside guitarist Juan Manuel Arabehety, keyboardist Federico Pozzo, and drummer Santiago Sauza. Their 2019 EP "Horrors From Aeons Past", released on Corpse Torture Records, drew praise for keeping a pure blackened thrash sound anchored by chilling black metal vocals over a driving thrash framework.

Azbuk was a São Paulo band whose sound shifted from black metal in its early years to death metal in later recordings, making them an outlier in Brazil's typically genre-entrenched underground. Founded in 1997, the band had an on-again, off-again existence over two decades with rotating lineups and evolving lyrical themes — from Christian-influenced content to war and social commentary and back again. Their Bandcamp discography includes the "Meremoth" EP among other releases.

Aziagus is a Brazilian black 'n' roll band formed in 2022, blending the primitive drive of black metal with hard rock swagger in the tradition of acts like Motorhead and Darkthrone's later records. The band operates in Brazil's underground extreme metal circuit and has a presence on Metal Archives, though their city of origin is unconfirmed. Their music emphasizes raw energy and groove over technical elaboration.

Azor is a heavy metal band from Ameghino, Buenos Aires Province, Argentina, formed in 2015. The band has contributed to regional metal compilations including "Awqatinku - Volumen 3", a collection documenting underground metal acts from across Argentina.

Azoth is a thrash metal band from Brasília, Brazil, active since 2015. Named after the alchemical term for mercury and the philosophical universal solvent, the band delivers aggressive, riff-driven thrash rooted in the classic Bay Area and Brazilian traditions. They remain an active presence in the Brasília metal underground and maintain a Bandcamp profile through Azoth Recordings.

Aztlán is a death metal band from Bahia, Brazil, founded by bassist/vocalist Marcello "Paganus" Antunes — an economist and historian with a deep focus on pre-Columbian civilizations. Drawing exclusively on Aztec mythology, cosmology, and history, the band blends old-school death metal with black and traditional heavy metal elements to narrate the stories of the Mexica empire. Their discography includes the 2018 single "Blood Offering," the 2019 EP "Entrance to Mictlán," and the 2025 EP "Xipe Totec," the latter of which earned six nominations in Roadie Crew's annual awards.

Azul Turquesa is a doom/black metal project from Paraíba, Brazil, founded by Mailton "Soturna Cröstä" Lemos as a DIY solo effort in late 2021 before expanding to a full lineup. The band blends the crushing weight of doom metal with the abrasive atmosphere of black metal, with vocals that shift between eerie spoken word and raw screams over slow, hypnotic riffs. Their debut demo and the EP "Pusilânime" explore themes of existential dread, depression, horror, and the macabre.

Açoite is a death metal band from São Luís, Maranhão, active since 2018 and part of the growing extreme metal scene in Brazil's northeastern region. Operating independently, the band channels the raw, aggressive spirit of old-school death metal from a city rarely associated with the genre, placing them among the few extreme acts representing Maranhão on the national underground map.

Ação Libertária is an antifascist crossover thrash band from Natal, Rio Grande do Norte, Brazil, blending hardcore punk aggression with thrash metal riffing and sharp socio-political commentary. Their 2016 full-length "Cidadão de Bem" — a sardonic swipe at Brazilian conservative culture — captures the band's confrontational energy and reflects the turbulent political climate of mid-2010s Brazil.