Animus Necandi is a thrash metal band from Salvador, Bahia, Brazil, drawing from the aggressive, fast-picking tradition of Brazilian thrash metal. Originally active from 2004 with a 2005 demo titled "Bloody World," the band later resumed activity, representing the thrash underground of Brazil's northeastern capital.

Aniron is a symphonic gothic metal band from Buenos Aires fronted by soprano vocalist Bárbara Rossi, whose lyrical singing is the defining element of the band's sound. The project coalesced around guitarist Diego Mancilla and keyboardist Julio Sotelo before Rossi joined, and the band released their debut EP Concealed Within in July 2013. The name Aniron is taken from Elvish, meaning "I desire."

Ankh is a heavy metal band from Porto Alegre, Rio Grande do Sul, one of Brazil's most prolific metal cities. Active since the mid-1990s, the band has gone through several lineup shifts over the years while maintaining a traditional heavy metal approach. Their lone documented studio recording is the 2005 demo "Rest in Peace."

Ankhalimah was a symphonic power metal band from Niterói, Rio de Janeiro, founded by Guilherme Klausner and Yuichi Inumaru. The band crafted conceptually ambitious material drawing on Egyptian hermopolitan mythology, the Silmarillion, and Jewish Kabbalistic mysticism — even incorporating Quenya lyrics in their choral arrangements. They released a self-titled album in 2013 before disbanding.

Ankt is a black/doom metal duo from São Paulo, Brazil, whose slow-burning approach fuses the abrasive texture of black metal with the crushing weight of doom. The project released its self-titled debut album in 2017 after a four-year gestation period, comprising eleven tracks that established their murky, oppressive sound.

Anmod is a brutal death metal and grindcore trio from Curitiba, Paraná, operating in the self-described "death-grinder" tradition. Comprising Johnny R.R. on drums, Hernan on bass and vocals, and Alex W.A. on guitars, the band grew out of the ashes of Fornication and has released at least two full-lengths: "Monstrosity per Defectum" and "Inner Upheavals."

Annihilation is an old-school death metal band from Osasco, São Paulo, fronted by the vocalist known as Vomit Blasphemy Tormentor. The band deals in raw, aggressive death metal in the tradition of Brazil's extreme metal underground, and released the album "Evil Churches" in 2024.

Anomalia were a metal band from Tigre, Buenos Aires who started out playing thrash and death metal before shifting toward metalcore over the course of their career. The band released two albums — Mea Culpa (2012) and Una Vida en el Infierno (2015) — with the latter marking a move to all-Spanish lyrics and a cleaner, more melodic approach. The lineup at their most active featured vocalist Ramiro Arias, guitarist David Lapalucci, bassist Ariel Olarte, and drummer Javier Cuello.

Anomalistic is a two-piece slam and brutal death metal band from São Paulo, Brazil, consisting of vocalist Fabio K and guitarist João Holzer. Their sound centers on crushing slam breakdowns interwoven with elements of technical and melodic death metal, and their discography includes the albums "Butchery" (2013), "Dissecting the Living" (2014), "Human Decimation," and "Azoic" (2020).