Aquila is a progressive metal band from São Paulo, Brazil, formed in 2009 and active in the city's independent metal scene. Operating without major label backing, they pursue the technically demanding side of progressive metal with a focus on composed, layered arrangements. The band remains active as an independent act within São Paulo's diverse heavy metal community.

Arcane Sanctuary is a symphonic progressive metal band from Rosario, Argentina, built around guitarist and bandleader Francisco Romero alongside vocalist Juliana Penacino, bassist Luciano Vittone, and drummer Jeremías Scoccimarro. The band released their debut full-length album "The Traveler's Diary" in August 2025, a nine-track record described as a journey through human emotions, time, life, and death. Their music fuses the complexity of progressive metal with orchestral and symphonic arrangements, making them one of Argentina's emerging acts in the genre.

Arrebol is a progressive metal project from Santiago, Chile that has released material including the album "Simplicity of the Moment" (2023) and the EP "Four Leagues Away" (2024), the latter issued as a limited digipack of 66 copies. The project's output blends progressive metal with atmospheric and extreme metal influences.

Ashes of Mirra is a progressive metal band from Rio de Janeiro, formed in 2023, featuring vocalist Weslen Amorim, guitarists Fabio and Sebastian Garcia, and bassist Roberto Ribeiro. The band released their early material on Bandcamp, with tracks including "The Pangea Puzzle," "Limit," and "Speechless," pointing toward a sound that favors compositional depth within the progressive metal tradition.

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.

Atroz is a heavy and progressive metal band from Juiz de Fora, Minas Gerais, with roots going back to 1998 under various configurations. Their self-titled 2021 release on Bandcamp marked a renewed presence, and the band draws on a range of heavy and progressive influences rooted in the fertile Minas Gerais metal tradition.

Aura Scent is a death/thrash metal band with progressive elements hailing from Osório, Rio Grande do Sul, Brazil, formed in 2021. Operating in the extreme underground of southern Brazil, they blend the aggression of death and thrash metal with progressive song structures, a combination relatively rare in their coastal Rio Grande do Sul home city.