Australes Tenebris was a black metal band from Erechim, Rio Grande do Sul, Brazil active between 2013 and 2017, whose name evokes the southern darkness of their home region. They released a demo — "Quando Uiva o Minuano" (named after the cold pampas wind) — and the full-length "Reflections of a Decadent Life" (Sunset Light Records), exploring themes of philosophy, misanthropy, madness, and decay before dissolving in 2017.

Autism Forest is a one-person black metal and dungeon synth project from Buenos Aires, Argentina, created by the musician known as Avgrund. The project is prolific in releasing lo-fi atmospheric material, with titles including Arcane Nature, Thalassophobia, and the Dreams of Pelpiland series, as well as the 2025 EP Doppelganger.

Autodestrutivo is a depressive black metal solo project from Curitiba, Paraná, Brazil, formed in 2022 by a lone musician credited as Ignorado. The project channels sixteen years of personal connection to the DSBM genre into bleak, self-destructive compositions, releasing "DSBM – Depressive Music for Desolate People" (2024), described as music created for "emotionally destroyed people."

Autofobia was a black metal band from Ancud, in the Los Lagos region of southern Chile, active and split-up in 2012. During their brief existence they released two recordings — the EP Misantropía and a self-titled demo — both exploring themes of misanthropy, depression, and anti-Christianity.

Autopsia is a thrash metal band from Pindamonhangaba, São Paulo state, Brazil, one of the country's long-running underground acts with roots stretching back to 1989. Having persisted through more than three decades in the Brazilian extreme underground, they represent the tenacious provincial thrash metal scene that developed outside the major centers of São Paulo and Rio de Janeiro.

Autrest is the atmospheric black metal solo project of Matheus Vidor from the mountainous region of Rio Grande do Sul, Brazil, founded in winter 2022. Drawing on nature-influenced acts like Saor, Caladan Brood, and Eldamar, the project incorporates field recordings of forests and mountains into its compositions; the debut album "Follow the Cold Path" (2023, Northern Silence Productions) earned widespread critical acclaim, with a follow-up "Burning Embers, Forgotten Wolves" cementing Autrest as one of Brazil's standout atmospheric black metal exports.

Auvernia is a progressive power metal band from Buenos Aires, Argentina, built around vocalist and guitarist Fernando H. Varela alongside drummer Juan P. Verni and bassist Guido Quaranta. The band released their debut full-length Towards Eternity in 2008 on Galileo Records, a nine-track album blending soaring melodic vocals, double-bass drumming, and symphonic keyboards with cover versions of X Japan's "Blue Blood" and Queen's "The Show Must Go On" as bonus tracks.

Avaken is a power/thrash metal band from Recife, Pernambuco, Brazil, formed in 2020 and part of the northeast's small but growing heavy metal underground. They combine the melodic ambition of power metal with thrash metal's velocity and aggression, an approach that connects them to Brazil's long tradition of technically sharp, high-energy metal.

Avalon is a thrash/power metal band from Teresina, Piauí, Brazil, originally formed in 1987 before reuniting with a new formation around 2009. Drawing influence from the classic thrash canon — Metallica, Slayer, Anthrax — alongside baroque composers like Vivaldi, they released two full-lengths in the early 1990s: Old Psychotic Eyes (1993) and Incognito (1994) on Cogumelo Records, and their 1989 split with Megahertz remains a landmark of Brazilian thrash. A 2020 reunion produced the Avalon Anthology compilation and new tracks on The Thrash Metal Takeover Vol. 1.