Artilharia was a thrash/death metal band from Jaguariúna, São Paulo, with earlier roots in the band Hellhunter before a name change. Playing aggressive, garage-style extreme metal with Portuguese-language lyrics in a style reminiscent of 1980s Brazilian thrash, they released the demo Assassinos do Abismo before splitting up.

Ascoculto is a death metal and grindcore band from Viña del Mar, Chile, who recorded and released their debut album "El Comegente" in 2007 on Niño Abuelo Records, tracked at Estudios Cero DB. They subsequently appeared on the 2009 split "Brutal Anal Devastation" alongside Chilean acts Visceral, Vomitos y Reflujos, and Triquinosis.

Ascoroso is a goregrind and death metal band from Sousa, Paraíba — a notable outpost for extreme metal in Brazil's Northeast region. Formed in 2020 and fronted by vocalist Capiroto, the band has been prolific in the split format, releasing material alongside acts like Vítimas do Crack and Murgo, with Portuguese-language track titles dealing in visceral gore imagery. They appeared on the 2020 international compilation "The Great Blood Feast Vol. 1."

Aske is a black/death metal band from São Carlos, São Paulo state, operating in the Brazilian extreme metal underground since 2018. Their approach sits firmly in the raw, aggressive end of the black-death spectrum, with releases distributed independently through Bandcamp.

Asmodeus is a thrash/death metal band from Fortaleza, Ceará, with roots tracing back to the city's early heavy metal underground. After a long dormancy, the band was reactivated around 2015 to mark the 30th anniversary of the Tempestade Metálica festival — a cornerstone event in Ceará's metal history — and have since recorded two studio albums: Parabellum (2018) and Continuamos a Falar de Flores (2021).

Asphalt Grieving is a black/death metal act from Santiago, Chile, who debuted in January 2024 with the EP "Lack of Certainty," released by Black Legion Records as a limited clear CD edition of 300 copies worldwide. Later in 2024 they released a second EP, "Transgression of the Quantum Self: Tertiary Magnitude," featuring session drums by Krzysztof Klingbein and three tracks totaling approximately 24 minutes.

Asphyxiated is a death metal band from Salvador, Bahia, formed in 2022 and representing a newer generation of extreme metal emerging from Brazil's northeastern coast. Operating as an independent act, the band adds to Salvador's growing underground metal presence.

Aspidis is a dissonant black/death metal band from Jaraguá do Sul, Santa Catarina, founded in 2012. Their 2017 EP Reborn From Darkness and their more recent album Intruding Voices (2025) reflect a dense, abrasive approach to the genre with roots in the dissonant death metal current popularized by acts like Ulcerate and Gorguts.

Ass Flavour is a death/grindcore band from Vila Velha, Espírito Santo, active since 2005 and known for gore-drenched splatter-death metal in the tradition of Carcass, Pungent Stench, and Cannibal Corpse. Their 2015 album Dirty Procedure showcases ultra-fast drumming and multi-timbred growling vocals alongside pathological themes, and members have since branched into related projects including the death/black metal act Impugnant.