Altú Págánach was a folk black metal band from Lavras, Minas Gerais, self-described as practitioners of "Pure Folk Tolkiean Black Metal," blending raw black metal with folk elements and lyrical themes drawn from J.R.R. Tolkien and old paganism. The project was led by the multi-instrumentalist known as Dungortheb, and their discography — including the 2018 EP "The Wizard" and a split "The Old Legacy" — was later compiled and reissued by Cold Art Industry.

Alyiria is a progressive symphonic death metal band from Teresina, Piauí, formed by vocalist Bruna Soares alongside Ícaro Allysson, João Arthur, and Leonardo César. Their debut album "Heiress" (2023) is a concept record tied to a dark fantasy novel, drawing comparisons to Fleshgod Apocalypse and Cradle of Filth for its hour-long runtime, neoclassical guitar solos, and densely orchestrated arrangements.

Amaduscias is a death metal band from Carazinho, Rio Grande do Sul, formed in 2003 and rooted in the fierce extreme metal tradition of southern Brazil. Starting as a black metal act, they evolved into brutal death metal territory, with lyrical themes centered on war, paganism, and the bloody revolutionary history of Rio Grande do Sul; their album "Conceived Annihilation" documents this direction.

Amargo is a Brazilian raw black metal solo project by Victor "Oguh" Ramos, who handles all instruments, vocals, and lyrics. Rooted in the tradition of second-wave black metal with acknowledged influences ranging from Burzum and Darkthrone to local acts Sarcófago and Mystifier, the project released its debut album "Processo de purificação" in 2015 on the Ad Eternum label, blending lo-fi atmospheric black metal with dark ambient elements. A subsequent split with Kav was released through Wolfmond Production, cementing Amargo's place in Brazil's underground raw black metal underground.

Amazarak is a São Paulo black metal band with roots going back to 1997, when they operated under the name Mandragora before adopting their current name around 2001. The band deals in Satanic and anti-Christian themes, and their discography includes the 2009 full-length "Ascensão do Anticristo", a 2016 split with Nervochaos, and the 2023 release "Impuro Armagedom". Tracks like "Hino de Blasfêmia" and "Comando Blasfêmia" have circulated widely in Brazilian underground metal circles.

Amazon is a melodic heavy metal and rock band from Valinhos, São Paulo, Brazil, playing a style influenced by European power and melodic metal traditions with a focus on themes of love, fantasy, and Brazilian culture. The band is associated with Ravenheart Music and was previously known as Silent Saga. Their sound sits in the melodic and accessible end of the Brazilian heavy metal spectrum.

Ambition is a heavy metal and hard rock band from Curitiba, Paraná, Brazil, playing a straightforward blend of classic heavy metal riffs and hard rock energy. The band released material through Infernö Records, a French underground metal label known for promoting underground acts. They represent Curitiba's growing metal scene, a city that has produced a number of important Brazilian black and extreme metal bands.

Ambivalentt is a groove and thrash metal band from São Paulo, Brazil, formed in 2018. The band released a self-titled EP in April 2018, drawing on the city's rich tradition of crossover and groove-inflected thrash. São Paulo's dense metal underground has long been a hotbed for thrash acts pushing toward heavier and more rhythmically aggressive territory, and Ambivalentt fits squarely within that lineage.

Amduat is a death metal solo project from La Paz, Bolivia, created by multi-instrumentalist Gino (Hor) Torrico, who handles drums, guitars, bass, and vocals. The project's debut full-length Paths of the Psyche, recorded at Estudio Powersound in La Paz and released in 2022, draws on themes of occultism, witchcraft, nature, and consciousness within an extreme metal framework.