Azog is a black metal project from Buenos Aires, Argentina, formed in 2018 and driven by the musician known as Azog the Hierophant. Operating within the raw and underground end of Argentina's black metal scene, the project carries on the tradition of abrasive South American black metal.

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.

Ação Negro is a melodic death metal band from Duque de Caxias, Rio de Janeiro, writing all their lyrics in Portuguese around themes of social contestation, ideological conflict, and existential struggle. Formed in 2016, the band blends melodic death metal structures with the social commentary more often associated with Brazilian hardcore, carving out a distinctive identity in the Rio de Janeiro metal underground.

Aüscülta is a death metal and grindcore band from Aracaju, Sergipe, Brazil, formed in 2021 and part of a small but tenacious extreme metal scene in Brazil's northeastern interior. Their name — a stylized rendering of the Portuguese/Latin word meaning "listen" — signals an abrasive, confrontational approach to brutality, combining death metal's heaviness with grindcore's short-burst intensity.