Jackhammer are a power/thrash metal band from Jandira, São Paulo, Brazil. Founded by Leo Axekiller (bass/vocals), Marcelo Barbosa (guitar/vocals), and Bruno Barbosa (drums), the band draws from American thrash metal, German metal, NWOBHM, and hardcore influences. They released their debut album Hard to Be Alive in 2009 and have remained active in the São Paulo metropolitan area's metal circuit.

Jatere is a thrash/death metal band formed in Asunción, Paraguay in 2025. They released their debut demo "La muerte no da risa" in December 2025, a three-track release with Spanish-language titles that showcases their aggressive crossover of thrash and death metal influences.

Jesushed is a thrash and heavy metal band founded in 2014 by Fabio Curtis in Mogi das Cruzes, São Paulo, Brazil. Drawing on Christian faith without being a strictly gospel act, the band's songs address current events, biblical narratives, and social themes. Their discography spans the debut album Born Again (2014), the EPs 350 graus (2016), Fim dos tempos (2018), and Supermother (2020), with Curtis handling vocals, guitars, and production throughout.

Juggernaut are a thrash metal band from Blumenau, Santa Catarina, Brazil, founded in 2005 by guitarist Célio Jr after his departure from the local band Rhestus. The group blends aggressive thrash with progressive rock and metal influences, and their third full-length La Bestia (2021) — recorded with vocalist Cicero, bassist Valda, and drummer Alefer — tackled xenophobia and social issues across Latin America.

Jäger Miliz is a thrash metal band from Puerto Montt, Chile, formed in 2016 by members Jorge Trujillo, Fabian Soto, Martin Trujillo, and Miguel Yáñez. Their debut release, Demo MMXXI (2021), recorded and mixed at Supra Producciones, includes two original tracks alongside covers of Venom's 'Welcome to Hell' and 'Black Metal.'