Acid Brigade was a thrash metal band from Londrina, Paraná, Brazil, active from 2016 to around 2019. They released the demo "Addiction to Distortion" in 2016 and followed it with their full-length "Storming Into This Land" in 2019, a record tracked at Toque Grave Estúdio and noted for its palm-muted riffing and old-school new-wave-of-thrash energy.

Acrostic are a thrash metal band from Viña del Mar who describe their sound as "Noisethrash" — a blend of old-school thrash, hardcore punk, and crust rooted in the Bay Area and European thrash traditions. The trio of Janito Attack, Pablito Attack, and Pelao Attack released their full-length "Sincretismo-Posguerra" in November 2016 on Underground Defenders Records, a 11-track record recorded at JRP Studios in Viña del Mar and limited to 500 copies.

Age Nor Defields is a crossover thrash quintet from Mongaguá, on the São Paulo state coast of Brazil, fusing thrash metal with hardcore punk energy and grindcore experimentation. Their album "Mongahell" is a 25-minute barrage of politically charged, anti-fascist material delivered in Portuguese, mixing protest and class consciousness with acid humor and absurdist provocation. Reviewers have noted their earnest, exuberant approach and the Zappa-esque tendency to wrap pointed social commentary in comedic delivery.

Aggresion is a death/thrash metal band from Campo Grande, Mato Grosso do Sul, formed in 2012 and operating as a power trio with Eduardo Sparrenberger on vocals and bass, Caverna on guitar, and Felipe TerrorDeath on drums. Their 2024 album Covil de Feras, recorded at Estudio 45 in Campo Grande, leans into Brazilian folklore and indigenous resistance as lyrical themes, pairing them with a raw, satanic extreme metal aesthetic. The band contributed to underground anti-fascist metal compilations in 2018 and 2019.

Aggression Tales are a thrash metal band from São Paulo founded in 2006 by guitarist Felipe Ruiz alongside vocalist/bassist Bruno Pompeo and drummer Julio Príncipe. Their 2007 debut Scribbles in Blood is a concept album narrating the life of a fictional serial killer, with each of its twelve tracks written in collaboration with ten different fiction authors who each penned a chapter of the story. They followed it with Random Acts of Physical Disgust (2011) on Six Inch Nails Records, cementing a sharp, aggressive thrash attack with a dark literary bent.

Aggressors are a death/thrash metal band from Botucatu, São Paulo state, formed in 2014 around members who previously played together in a different project. Their debut EP The First Evil, released through Odioground Records in September 2016, delivers four tracks of grinding riff-driven thrash with death metal brutality and lyrical themes focused on war, religion, and political critique.

Agnus Die are a thrash metal band from Vinhedo, São Paulo state, formed in 2015 and active in the Brazilian underground thrash circuit. Based in the interior of São Paulo state, they play traditional thrash metal and remain an independent, grassroots act with limited wider documentation outside the Metal Archives registry.

Thrash metal band from Fortaleza, Ceará, formed in 2023. A very new entry into the northeast Brazilian metal scene, playing in the aggressive, riff-heavy thrash tradition that has long been a staple of Brazilian extreme metal.

Ahínco is a progressive death and thrash metal band from Mar del Plata, Argentina, active since 2013 with a lineup anchored by Lucho Alippi on bass, vocals, keyboards, and synths, Hernan Chave on guitar, and Ariel Sanchez on drums. Their prolific Bandcamp catalog includes releases such as La Canción de los Sepulcros (2020) and Quem Deus vult perdere, prius dementat (2021), the latter recorded at UC Dadson studio in Mar del Plata and mixing atmospheric depth with technical intensity. The band's work spans Spanish-language lyrical themes with a compositional range that draws on both death metal aggression and progressive architecture.