Antiklan is a post-doom and sludge metal trio from Natal, Rio Grande do Norte, Brazil, formed in 2022. The band — vocalist Julia Gusso, guitarist and bassist Flávio França, and drummer Max Barros — released their debut album 'Under Wetiko (Hymns from beneath the Veil)' in 2022, a five-track record recorded at Studio Black Hole in Natal and mixed in São Paulo. Their heavy, socially charged sound blends sludge and doom with an explicitly DIY, anti-authoritarian ethos, earning comparisons to punk-infused sludge.

Antikristo is a Black/Speed Metal band from Popayán, Colombia, formed in 2008. The band released several demos and splits before issuing their debut full-length Oscuro portador de luz, dador de visión eterna in 2019, followed by the EP Caos Ecsai in 2020 via Hellhoundz Productions.

Antimonument is an anonymous Brazilian extreme metal collective that emerged in 2021, fusing black metal, death metal, grindcore, hardcore punk, industrial noise, and power electronics into what they describe as a degenerative audio-visual ritual. Their debut album 'Concealment' appeared on CD via Cianeto Discos and cassette via Red Door Records before Sentient Ruin Laboratories issued an expanded vinyl edition with bonus tracks and a new master by Will Killingsworth. Drawing comparisons to Blasphemy, Incantation, Khanate, and Godflesh, the project operates with a deliberately depersonalized, collective identity.

Antireligion is a São Paulo-based one-man black/thrash metal project formed in 2011, rooted firmly in the old-school tradition of the genre. The project has released demos including 'Total Desolation' and 'Demo II: Unholy Blasphemies 2012–2014', channeling the raw, aggressive spirit of early Brazilian and European black/thrash pioneers. Lyrically, the project centers on anti-religious themes consistent with the second-wave black metal tradition.

Antro were a heavy and stoner metal band from Teresópolis, Rio de Janeiro, Brazil, active from 2014 until their split-up. Rooted in the fuzzed-out, riff-driven tradition of stoner and heavy metal, the band was part of a small but vibrant underground scene in the mountainous Serrana region of Rio de Janeiro state. They operated independently and released music through Bandcamp.

Antroforce is a thrash metal band from Carapicuíba, in the western zone of greater São Paulo, Brazil, formed as a tribute to the 1980s Brazilian metal underground — citing Dorsal Atlântica, Mutilator, Vulcano, and early Sepultura as primary influences. The band sings in Portuguese and released their self-titled debut full-length in 2019 on Bigorna Records, following a split with Harpago in 2015 and two earlier demos. Their 2021 single 'Sinfonia do Diabo' and subsequent album 'Antropocaos' show a band evolving within the classic Brazilian thrash framework.

Antropofagia were a death metal and grindcore band originating in Olinda, Pernambuco and later based in the neighboring city of Paulista, Brazil, formed in 2024 and split up shortly after. Operating within the brutal underground tradition of northeastern Brazilian extreme metal, the band drew on the visceral death/grind template and the 'antropofagia' concept — a cannibalistic cultural metaphor with deep Brazilian artistic roots — as both name and aesthetic. Their brief existence left a limited but intense recorded footprint in the local underground.

Antropofectus is a death/black metal project from Magé, in the Baixada Fluminense region of Rio de Janeiro state, Brazil, formed in 2021 and currently on hold. Blending the aggressive tremolo-heavy assault of black metal with the low-end brutality of death metal, the project is part of Rio de Janeiro's active underground extreme metal network. They released music independently through Bandcamp.

Antropomancia is a death metal band from Lima, Peru, formed in 2015 and signed to Unholy Domain Records. The band deals in themes of occultism, death, and violence, and has released demo recordings including "Promo MMXX" (2020) and "Morbid Initiation" (2021). Their work appeared on the compilation "Black and Death Compilation" with the track "Condemned to Malefice."