Blood Warrior was a thrash/death metal band from São Paulo, Brazil, active from around 2010 before eventually splitting up. The band blended the aggressive riffing of thrash metal with death metal heaviness in the tradition of Brazilian extreme metal. They released music independently and are documented in the Encyclopaedia Metallum.

Bloody Morgue is a death metal band from Porto Alegre, Rio Grande do Sul, Brazil, formed in 2015 under the name Infernal Warfare before adopting their current name. The band released a self-titled debut in 2016 and is currently an independent act, continuing to operate within the Rio Grande do Sul extreme metal underground.

Bloody Vomit was a death metal band from Belo Horizonte, Brazil, active in the early 2020s before splitting up. The band released the demo "He's Dead" and drew on the raw, aggressive traditions of the Brazilian extreme metal underground. They were active on SoundCloud and Bandcamp during their brief existence.

Bodhum is a death metal and grindcore band from Rio de Janeiro, Brazil, active since 2010. The band debuted with the EP "Sobre Homens E Porcos" in 2010 and has since released additional albums including "Causa Mortis", "Consórcio da Morte", and "Extremo". They participated in the 2020 Brazilian tribute compilation "A Brazilian Tribute To Nasum: Mieszko Lives", released through The Grind Records.

Bonesawer is a death metal and grindcore band from Rio de Janeiro, Brazil, formed in 2024. The band plays aggressive extreme metal in the death/grind vein and is listed on Encyclopaedia Metallum as a current active act in Rio de Janeiro's underground scene.

Boto não é Golfinho was a death metal and grindcore band from Londrina, Paraná, Brazil, active until their 2022 split-up. The band played fast, abrasive extreme metal in the noisecore tradition, releasing the album "Parlamentáveis" in March 2022, a nine-track record with a combined runtime of just over ten minutes.

Brutal Abyss is a death metal band from Fortaleza, Ceará, Brazil, evolving from an earlier project known as Dry Curse. The band released their debut full-length "Misanthropic Butcher" in 2018 through Extreme Sound Records, a ten-track album praised for its quality and passion and noted for influences from 1990s bands such as Grave and Gorguts. The album received top marks from multiple Brazilian metal publications and earned the band a physical CD release distributed across Brazilian metal shops.

Brutal Masturbation is a death metal and grindcore band from the Patagonian city of Comodoro Rivadavia, Argentina, active since 2017. The band released the Aborto EP, delivering short blasts of death-grind in the tradition of South America's extreme underground.

Brutal Reality is an old school death metal band from São Paulo, Brazil, active since around 2020. The band plays straightforward death metal with themes centered on social disorder, chaos, and violence, operating as an independent act in Brazil's thriving underground death metal scene.