Blood Ocean is a thrash metal band from São Paulo, Brazil, formed in 2014 and still active. The band plays in the aggressive tradition of Brazilian thrash metal and operates as an independent act within São Paulo's underground metal scene.

Blood Trail is a thrash metal band from São Paulo, Brazil, formed in 2022 as a side project by Alex Roque, known from Disorder Of Rage and other Brazilian metal acts. The band released the EP "World Corroded" in April 2022, a tribute to old-school thrash with raw material rooted in 1990s sounds alongside modern production touches. The project operates independently and remains active.

Bloodcraver are a thrash metal band from Duitama, Boyacá, Colombia, formed in 2014. They released their debut EP Skynet in 2018, a three-track independent recording produced in Colombia.

Blowpipe is a death/thrash metal band from Campinas, São Paulo, Brazil. The band draws direct influence from the major thrash metal acts of the 1980s and death metal bands of the 1990s, and released a self-titled album in September 2020 through their own Blowpipe Records imprint. Their lineup includes Jean Quiles on vocals, Gedeon Alves on guitar, Edynho Baiochi on bass, and Johnny Hoglan on drums.

Bode Maldito is a one-man black/death/thrash metal project from Rio Grande do Sul, Brazil, operating within the Brazilian underground extreme metal scene. The project released the demo "Sodomizing Christ" digitally in 2024, with a limited physical edition of 33 copies issued in late 2024 by Poland's Unpure Records as part of their DIY Ungodly Underground Series. Lyrical themes revolve around Satanism and anti-Christianity.

Bonebeast is a death/thrash metal band from Presidente Dutra in the central region of the state of Maranhão, Brazil, formed in late 2014. The band began as a duo with Matheus Coelho on vocals and guitars and Ely Araújo on bass, releasing early demos between 2015 and 2016. They completed their lineup with drummer Gabriel Matos in 2018 and recorded their debut EP 'From the Ashes to the Chaos' at Headcrusher Studio in São Luís, releasing it in 2019.

Bonecrusher is a thrash metal band from Belo Horizonte, Minas Gerais, Brazil, formed in 2019. Operating out of a city long associated with Brazil's extreme metal tradition, the band plays aggressive thrash metal and is active within the Belo Horizonte underground scene.

BoneStripper was a thrash metal band from Belo Horizonte, Minas Gerais, Brazil, formed in 2014. The band released the EP 'A View of Heaven from a Seat in Hell' in January 2014 and was active within the Belo Horizonte metal scene before eventually splitting up.

Borroza are a death/thrash metal band from Bucaramanga, Santander, Colombia, formed in 2000 and signed to the Colombian label Upzurdo. They released their debut full-length Fantasma in 2008—recorded and mixed at Upzurdo Records in Bucaramanga and mastered in Hollywood—and have contributed tracks to several Colombian metal compilations including Al Filo de Metal Vol. V.