Anastomose is a death metal and grindcore band from Sorocaba, São Paulo, Brazil, formed in 2020. Working in the tradition of Brazilian extreme metal, the band fuses the blunt force of grindcore with death metal brutality, operating as an independent act out of the São Paulo interior scene.

Anatofagia is a blackened gothic metal project from Moreno, in the western suburbs of Buenos Aires, built around vocalist Laura Causin and guitarist Nicolas Sonetti. The duo draws on black metal, death metal, and doom metal textures, with Causin's melodic female vocals giving the sound a gothic edge. Their releases include the self-titled album and the rawer follow-up Crudo.

Anatomy Corruption is a death/stoner metal band from Mundo Novo, Bahia, Brazil, formed in 2018. The band occupies an unusual niche, blending the psychedelic, riff-heavy groove of stoner metal with death metal aggression — a combination that sets them apart from the standard extreme metal output of Brazil's northeast.

Anax is a black metal band from Fortaleza, Ceará, Brazil, formed in 2011. Hailing from one of the largest cities in Brazil's northeast, the band operates in the underground black metal tradition, contributing to the region's gradually expanding extreme metal scene.

Anaxes is a progressive metal band from Caxias do Sul, Rio Grande do Sul, Brazil, originally formed in 2005 by guitarist Bruno Pinheiro Machado and drummer Thiago Caurio as an instrumental project before expanding into a full band with vocalists. Their debut album "Antithesis" (2010) drew comparisons to Symphony X, blending intricate guitar work with melodic, keyboard-accented arrangements, and the band has continued to develop within the South Brazilian prog-metal scene.

Ancaria is a progressive power metal project formed in 2012 by vocalist and keyboardist Ignacio Remis and guitarist Guillermo Olondriz in Argentina. The duo writes Spanish-language metal with sweeping arrangements, and their discography includes the 2022 album Mi Propio Destino and the 2024 full-length Contra el Viento. Both members handle composition duties jointly, with Remis also managing programming and production.

Ancestor is a death metal band from São Paulo, Brazil, formed in the mid-1990s and active in the city's dense underground metal circuit. The band has released material including "My Condolences" and "Greatest Shits", delivering fast, aggressive death metal rooted in the classic São Paulo extreme metal tradition.

Ancestral Cântico is a black metal sextet from Salvador, Bahia, whose sound blends occult ritual atmosphere with shamanic repetition and hypnotic riffing drawn from forebears like Mercyful Fate, Venom, Bathory, and Rotting Christ. Their thematic territory spans ancestral spirituality, witchcraft, hermeticism, and anti-colonial consciousness, setting them apart within Brazil's underground. They released their debut full-length Ancestrais Dizeres Profanos in 2015, followed by Cânticos Lunares (2018) and the sprawling Hermético Caminho dos Saberes Ocultos in 2024 via Sangue Underground Records.

Ancestral Terror is a death/thrash metal band from Catalão, Goiás, rooted in the old-school extreme metal tradition with lyrical themes of religious corruption, war, and iconoclasm. The band issued their debut recording Hallways of Pain and later appeared on the 2016 split Bacchanals of Horror alongside Rio de Janeiro act Orgy of Flies through Warhemic Productions. They have been on hold since around 2013.