Black Mass was a Black/Thrash Metal band from Belém, Pará, Brazil, formed in 2013. Operating out of northern Brazil’s oldest metal city, the band blended raw black metal aesthetics with thrash metal aggression. They released music independently, including material available through their Bandcamp page, before splitting up.

BlackForce is a death/thrash metal band from Niterói, Rio de Janeiro, Brazil. The band is signed to Profane Records and addresses themes including politics, religion, and the environment in their music.

Blackgoat Holocaust was a black/thrash metal band from Belo Horizonte, Minas Gerais, Brazil, active briefly before splitting up. The band was an independent underground act exploring themes of death, lust, and destruction in the tradition of the Brazilian extreme metal underground.

Blackning is a thrash metal band from Santo André, São Paulo, Brazil, formed in December 2013. The band has released three studio albums — Order of Chaos (2014), ALieNation (2016, nominated for best national heavy metal album at the Prêmio Dynamite de Música Independente), and Awakening Rage (2023) — and toured Europe in 2017, visiting Germany, France, the Netherlands, Belgium, Poland, the Czech Republic, and Russia.

BlankWar is a progressive thrash metal band from Bragança Paulista, in the interior of São Paulo state, Brazil, formed in 2016. The band released a self-titled debut album in 2016 and subsequently put out a single titled "BloodSuckers," carving out a niche within Brazil's active underground thrash scene.

Blasphemaniac is a black/thrash metal band from Atibaia, São Paulo, Brazil, playing what they describe as old school black speed metal rooted in blasphemy, satanism, and witchcraft. The band has released several records including "Lust Possession" (2021), "Bestial Occult Ceremony" (2022), and "Night of the Necromancer" (2023) via Black Hearts Records and Death Defier Productions. They performed at the Brazilian Harmageddon 2024 festival in São Paulo alongside international acts such as Sabbat.

Blasphemer is a death/thrash metal band from Santo André, São Paulo, Brazil, with roots in the local extreme metal underground. The band appeared on the "Headthrashers Live" compilation recorded at the Municipal Theatre in Santo André alongside Necromancia, MX, and Cova, documenting the early São Paulo thrash scene. Their lyrical themes centered on satanism, evil, war, and death.

Blasphemia was a black/thrash metal band from San Felipe, Valparaíso, Chile, with lyrical themes centered on apocalypse, anti-religion, and chaos. The band released two demos and one EP between approximately 2001 and 2005 before splitting up.

Blasthrash is a thrash metal band from São Paulo, Brazil, active since the early 2000s and signed to Dies Irae Records. Drawing heavily from 1980s thrash influences including Kreator, Exodus, and Nuclear Assault, the band released albums such as "Violence Just for Fun" and "Fake News", maintaining an old-school aggressive thrash sound across their career.