Bertoncelli is a melodic heavy/power metal project from Buenos Aires Province fronted by vocalist Christian Bertoncelli, a veteran of Argentine metal bands including Horcas, Imperio, and Renacer. The band released the full-length album Leyendas de amor y sangre in 2011, recorded and mixed at Doble B Studios in Buenos Aires. The project later continued under the name Holy Rock.

Bertran de Born is a drone/doom/sludge metal band from Bauru, Brazil, formed in 2015. The band released their debut demo "Malebolgia" in December 2015, an independent release listed on Encyclopaedia Metallum.

Berzerkers is a thrash metal band from Aracaju, Sergipe, Brazil, blending thrash with elements of death and speed metal. The band is an active independent act within the underground metal scene of Sergipe, with releases including the track "Machine Gun."

Besta Fera is a blackened death metal band from Natal, Rio Grande do Norte, Brazil, formed in 2007. The band released a split EP with Arma Laranja featuring tracks such as "Projétil" and "Caminhos Cinzentos," and maintains an active presence in the underground extreme metal scene of northeastern Brazil.

Bestial 666 is a black metal band from Goiânia, Brazil, with Satanic lyrical themes. The band is listed on Encyclopaedia Metallum and has since split up, leaving a short-lived but documented presence in the Brazilian underground black metal scene.

Bestial Atrocity is a satanic black metal band from Piracicaba, São Paulo, Brazil, playing a style that incorporates death metal and grindcore elements. Their 2007 demo "Odes To Satan" and the live recording "B.A.C.K. (Bestial Atrocity Creating Kaos)" document their activity during a reformed period before the band ultimately split up.

Bestial Curse is a black/thrash metal band from Niterói, Rio de Janeiro, Brazil, drawing influence from Hellhammer, Venom, and Bathory. The band features members with ties to Brazilian acts Apokalyptic Raids and Flagelador, and released the album "Masters of Mayhem," recorded at Eclypse Studio in Niterói, on Dark Sun Records.

Bestial Nuclear Atrocity is a Brazilian black/death metal band formed in 2022. They released "Holocausto Podre e Profano da Desolação" in September 2022, a recording mastered by Filipe Silva that places the band within Brazil's underground bestial black/death metal tradition.

Bestial Perception is a brutal and technical death metal band from La Plata, Argentina, featuring vocalist Necroseba and guitarist Martin Furkaz. The band released their debut album Pareidolik in December 2023 through Artes Negras Productions, with the album's title drawn from the psychological concept of pareidolia — the tendency to perceive meaningful shapes in random surfaces. Their sound centers on themes of catastrophe, sickness, and destruction.