Apócrypha is a heavy metal band from Villa Giardino, Córdoba, with roots going back to the mid-1990s and a discography that includes the albums "Cabezas de Metal" (2003), "Convicción Salvaje" (2008), and "A Los Motores Del Metal" (2012). The band operates independently and has maintained an active Bandcamp presence, releasing material and continuing to represent the Córdoba province metal underground. Their sound sits squarely in traditional heavy metal territory with a distinctly Argentine character.

Apóstasis is a melodic black/death metal band from Brasília, Brazil, whose 2018 self-titled album draws on Nietzschean philosophy and misanthropy as lyrical touchstones. Their sound fuses the melodic sweep of Scandinavian black metal with death metal aggression, reflecting the increasingly ambitious underground scene in Brazil's federal capital. The band remains independent and active.

Aquaria is a symphonic power metal band from Rio de Janeiro, formed in 2002 under the original name Uirapuru before adopting their current identity, and their debut Luxaeterna (2005) and follow-up Shambala (2007) were both mixed and mastered by Sascha Paeth at Gate Studios in Germany. Their sound weaves orchestral arrangements and soaring vocals around themes drawn from Brazilian mythology, nature, and spirituality. After a decade-long hiatus, the band returned with the album Alethea in 2020, featuring vocalist Vitor Veiga and keyboardist Alberto Kury.

Aquelarre was a black metal band from São Paulo, Brazil, active in the underground scene and aligned with themes of Satanism, anti-Christianity, and hate in the tradition of South American raw black metal. They contributed a track to the Times of War - A Tribute to M.M.D.C. compilation before splitting up, leaving a small but ideologically committed footprint in the São Paulo scene.

Aqueronte is a black metal band from Curitiba, Paraná, Brazil, part of the city's long-running extreme metal underground. Their approach is rooted in raw, traditional black metal with an uncompromising aesthetic, operating within a regional scene that has produced influential acts like Amen Corner and Blackmass. The band draws influence from classical composition alongside classic and contemporary black metal.

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.

Ar da Desgraça is a black metal band from Timbó, Santa Catarina, Brazil, whose name translates roughly to "air of misfortune." Their discography, including Praeludium Tenebras (2017) and Enigmática Perpétua Sinfonia (2020), explores themes of death, hatred, darkness, and melancholy within a raw, underground black metal framework. The duo features Peste Negra on vocals and guitar alongside Algoz on drums.

Arab Zaraq was a Brazilian black metal project active briefly in 2024 before splitting up, leaving minimal documentation in the underground. The name echoes the Qliphothic concept of A'arab Zaraq — the ravens of dispersion — a recurring reference point in occult black metal. Their release exists as a short-lived contribution to Brazil's prolific raw black metal underground.

Arabesco is a solo project from São Paulo, Brazil, formed in 2015 by multi-instrumentalist André Oliveira. The project blends acoustic elements with sludge and doom metal, creating a sparse and heavy sound rooted in the São Paulo underground scene.