Asterias is a stoner/sludge metal band from San Juan, Argentina, featuring Diego Oliver and Juan Montané sharing guitar and bass duties alongside Rodrigo Cardozo on guitar and Pedro Romano on drums. The quartet released Hijo de una Tormenta in 2021, a record that channels the heavy, riff-driven energy of South American stoner rock into dense, atmospheric territory.

Asterion is a progressive death metal band from Santiago, Chile, formed in 2006, featuring vocalist Matias Ibañez, keyboardist Eliseo Peña, guitarists Mauricio Silva and Alejandro Oliva, bassist Gustavo Miranda, and drummer Jorge Ovalle. The band released their debut album Nihil Perpetuum in 2008 and followed it with Zerzura in 2010 on Australis Records, blending elements of avant-garde, black, death, and doom metal.

Asteroidea was an instrumental progressive metal and shred band from Salvador, Bahia, founded in 2001 by guitarist Patrick Amorim — the name itself derived from the Latin word for the starfish class. Heavily influenced by guitar virtuosos Joe Satriani, Steve Vai, and Yngwie Malmsteen, the group focused on technically demanding original compositions rather than vocals, recording the demo Furthering Your Imagination in 2002 before eventually disbanding.

Astra was a progressive metal and hard rock band from São Paulo, Brazil, active from 2017 until their split-up. Working in the melodic, technically-oriented end of Brazilian progressive metal, the band released a self-titled recording before dissolving, part of a broader wave of São Paulo acts blending prog and hard rock influences in the late 2010s.

Astral Drowning is a post-black and doom metal project from Mendoza, Argentina, self-described as "melancholic doom black metal from the South," that began with the demo Ocaso in 2013. Their 2022 album Traditional Music from Rooms Underwater, composed over nearly a decade, incorporates melodica, flute, percussion, and field recordings alongside conventional metal instrumentation to create a deeply atmospheric sound.

Astralscape is a solo melodic black metal project from Rio de Janeiro, the work of multi-instrumentalist Igor Goularth, who handles vocals (clean, harsh, and choral), guitars, bass, keyboards, and programming entirely on his own. Inspired primarily by Covenant/The Kovenant's In Times Before the Light and drawing from Emperor, Limbonic Art, Borknagar, and Arcturus, the project released its debut four-track EP in August 2024, exploring cosmic and astronomical themes under the tag of space and cosmic black metal.

Astralvm is an atmospheric melodic black metal solo project from Osorno, Chile, created by multi-instrumentalist Egon Gubernatis. The project is entirely instrumental and its 2022 album Existence earned recognition as Black Metal Release of the Year from the metal publication Metal Has No Borders.

Asylum was a doom/black metal band from Araguari, Minas Gerais, formed in 2014 and later split-up. Situated in the Triângulo Mineiro region of Minas Gerais — a state with deep roots in Brazilian extreme metal going back to Sepultura and Sarcófago — the band melded the slow, crushing weight of doom metal with the atmospheric coldness of black metal.

A black metal act from Campina Grande do Sul, Paraná, formed in 2025. Their Bandcamp catalog already includes multiple releases — "I Can't Forgive Myself," "On the Edge of the Cliff," and "Violated" — suggesting a productive start for such a recently formed project. They represent the newer wave of underground Brazilian black metal emerging from the interior of Paraná state.