Bael was a black metal band from Santo André, São Paulo, Brazil, formed in 2024 and short-lived. Emerging from the Greater São Paulo underground, the band pursued the raw and nihilistic black metal aesthetic before splitting up the same year they were founded. Their brief existence places them within the dense web of São Paulo-area black metal acts working in the underground tradition.

Bagronk is a death/black metal band from the southern suburbs of Greater Buenos Aires, Argentina, with roots going back to an early 2000s formation. The band recorded the demo "Death and Blood Valley" and has built a persistent presence in the Argentine underground extreme metal scene across multiple active periods.

Bagual is a stoner metal and heavy psych band from Santiago, Chile, comprising Francisco "Greengo" Yañez (guitars and vocals), Felipe Machuca (guitars), Julián "Lobo" Inostroza (bass), and Alejandro Clavijo (drums). The band debuted with I: Viento Sur (2014) and followed with II: Viento Norte (2015), both recorded independently in Chile, and have continued releasing music through Nulla (2017) and Inhvmar (2024).

Bagual is a stoner metal and heavy psych band from Santiago, Chile, comprising Francisco "Greengo" Yañez (guitars and vocals), Felipe Machuca (guitars), Julián "Lobo" Inostroza (bass), and Alejandro Clavijo (drums). The band debuted with I: Viento Sur (2014) and followed with II: Viento Norte (2015), both recorded independently in Chile, and have continued releasing music through Nulla (2017) and Inhvmar (2024).

Baixo Calão is a grindcore band from Belém, Pará, operating out of the Amazon region and representing one of the more distinctive voices in Brazil's northern underground extreme metal scene. Their sound is rooted in old-school grindcore — relentless blasts, caustic riffs — with lyrical themes targeting anti-religion, social decay, and political corruption. The band gained notable exposure through the European underground circuit, including a performance at the Obscene Extreme Festival in the Czech Republic.

Bajo el Exilio is a five-piece metalcore and hardcore band from Santiago, Chile, who have been active since around 2009–2010 and built a catalog spanning heavy studio albums and live recordings. Their releases include the EP Tras las Cadenas (2010), the full-length Nuestros Verdugos (2013), Resistance (2016), and Contraluz (2023), with the sprawling live-and-studio hybrid Entre Sombras y Ruido following in 2025. All production on Contraluz was handled in-house by guitarist Darío Llancamán, reflecting the band's self-sufficient approach to their craft.

Balisttica is a heavy metal band from Belo Horizonte, Minas Gerais, a city with a deep metal tradition that produced foundational Brazilian acts like Sepultura and Holocausto. Formed in 2025, the band is an early-stage act with minimal documented releases, playing traditional heavy metal within a scene that has long been one of Brazil's most fertile for the genre.

Balmung is a heavy metal band from Puerto Montt, Los Lagos, founded by members including Héctor Einherjer (ex-Estigma) and Adolfo Wagner, blending power metal energy with neoclassical technique. The band released their debut five-track EP Mors Crucis in December 2023 through the independent label Infernal South Production, showcasing tightly executed classic-style heavy metal. As of 2025 they were in the mixing phase of their debut full-length album.

Balrog is a speed/thrash metal band from Villa Ballester, Buenos Aires, formed around 2000. The band released the album "No nos Detendrán" in 2014 and has featured vocalist and bassist Omar "BuBBa" Fernández alongside guitarist Lautaro Medina as core members of their long-running lineup.