Funeral doom metal project from Brasília and Natal, formed in May 2020 to craft a more dramatic strand of the genre by weaving in atmospheric black metal and post-metal textures. Their 2021 debut full-length "Væneration," released in a limited edition of 300 slipcase copies on Cianeto Discos, was produced by Breno Xavier and Thiago Satyr and explores themes of human insignificance and cosmic horror across seven tracks.

Apocalipsis is a heavy metal band from Grand Bourg, Buenos Aires, originally formed in 1984 by high-school friends Gustavo Zavala (bass) and "Turco" Atala (guitar), who are widely regarded as direct precursors to Tren Loco. The band released demos including "Endemoniado" (1985) and "Calles de Buenos Aires" (1987), won a notable band contest in March 1986 covered by Argentine magazines Metal and Riff Raff, and eventually reunited — their self-titled album was reissued on vinyl in 2012 by Sade Records in 300 hand-numbered copies.

Death metal and grindcore band from Catanduva, São Paulo, formed in 2023. Combining the blastbeat-driven brutality of grindcore with the riff density of death metal, they operate within Brazil's long-established tradition of extreme underground metal. The band self-releases their material on Bandcamp.

Apocrifo was a thrash metal band from Fortaleza, Brazil, whose lyrical focus centered on the great fallacies and contradictions of modern society. The band released the two-track demo "No Alvo" in 2014, delivering tightly wound, palm-muted thrash in the classic Brazilian tradition before splitting up.

Apocryph was a short-lived Rio de Janeiro project operating in the rare crossroads of epic, atmospheric, and avant-garde metal. Formed in 2020 and having split up not long after, the band left a minimal footprint but occupied an ambitious niche within Brazil's underground extreme metal scene.

Apofenia is an old-school death/thrash metal band from the city of San Luis, Argentina, formed in late 2015 and playing their first show in January 2016. The band released their debut demo "Peste" in July 2016, a five-track assault featuring tracks like "Descuartizado" and "Muerte" rooted in brutal, no-frills extreme metal. Driven largely by siblings Anabelle Escudero on drums and Gisselle Escudero on guitar and vocals, Apofenia became one of the more notable all-female extreme metal acts in Argentina's interior provinces.

Apofis is a black metal band from Quito, Ecuador, formed in 2021. Drawing on themes of darkness, rituals, mysticism, and misanthropy, the band has self-released a string of EPs including Rituals in the Dark, Reborn in the Black Sky, and The Mountain Mist, as well as contributing to a 2023 split release. They remain an active independent act in Ecuador's underground black metal scene.

Apoka is a black metal band from São Paulo, Brazil, active since 2020 within the city's dense underground extreme metal community. Their sound draws on the rawer, uncompromising traditions of the genre that have long flourished in southeastern Brazil.

Apokalyptic Raids is a black/death/thrash metal band from Rio de Janeiro, originally formed in 1998 as Apocalyptic Raids — a name drawn directly from a Hellhammer EP — before adopting the current spelling in 2001. Driven by guitarist and vocalist Leon "Necromaniac" Manssur, they have released a string of albums and splits since their debut "Only Death Is Real" (2001), channeling the proto-black metal ferocity of Hellhammer, Bathory, and Vulcano while collaborating with acts like Whipstriker and Atomic Roar.