Abominatus is a black metal band from Garanhuns, Pernambuco in Brazil's northeast, formed around 2001 under the name Melancholic before adopting their current identity. The band plays satanic and anti-Christian black metal and released the album Kill the Christians in 2011, featuring symphonic elements layered over orthodox black metal hostility.

Abominor was a black metal band from Barra Mansa, Rio de Janeiro, active from 2015 until their split-up. The band played dissonant, uncompromising black metal and released recordings including Oration MMXVI and Source of Chaos during their run in the Brazilian underground.

Aborior was a black metal band from Brasília, active during the mid-2000s to around 2010. The band played raw black metal with anti-Christian lyrical themes, part of a wave of underground extreme metal acts that emerged from Brazil's federal capital in the 2000s decade.

Abysmal Forest is a black metal band from Lavras, Minas Gerais, Brazil, with a history stretching back to 1995. The band released the demo 'Para sempre... reinarás' in 2002 and the CD/DVD 'Tributo aos Irmãos' in 2008, operating as an independent underground act within the Brazilian black metal tradition — not to be confused with the separate Abysmal Forest from Teresina.

Abyssal Pain is a depressive black metal and ambient project from Angra dos Reis, Rio de Janeiro, Brazil, exploring themes of negativity, pessimism, and emotional dissolution. The project has released a substantial run of albums — including "Der Nagel im Sarg," "Frio Esterilizante," "Desvanecer," and "Catarse" — and contributed to the DSBM Brazil Vol. II compilation, situating itself firmly within the Brazilian DSBM underground.

Abütre is a black metal band from Porto Alegre, Rio Grande do Sul, Brazil, formed in 2024 and part of the state's active underground extreme metal scene. A recently formed act with minimal documented output, they operate within the raw, underground tradition of Brazilian black metal.

Acacia Caven is a black metal duo from Córdoba, Argentina, formed in 2021. The band released their self-titled debut EP in July 2021, a five-track digital release spanning raw black metal and post-black metal textures with tracks including "Asfixia," "Vacío," and "Vidrio." Their music also appears on the label GSP Bandcamp, widening their reach within the Argentine underground scene.

Acrópole is a black metal band from Rio Brilhante and Dourados in Mato Grosso do Sul, active since 2020. Based deep in Brazil's interior rather than in the traditional urban metal centers, the band operates in the raw, atmospheric tradition of Brazilian black metal, contributing to what is a notably sparse but growing extreme metal presence in the Mato Grosso do Sul state.

Actum Est is a symphonic black metal band from Belo Horizonte, Minas Gerais, featuring a six-piece lineup that incorporates cello alongside traditional metal instrumentation — a rare texture in Brazil's black metal scene. Formed in 2005 (catalogued under their current activity since 2013), the band released the demo Obscure Symphonies Into the Black Mantle in 2006, channeling themes of occultism and darkness through a lush, orchestrated approach that sets them apart from the rawer strains of the Brazilian underground.