Arcana Elysium is a female-fronted symphonic metal band from Petrópolis, Rio de Janeiro, Brazil, formed in 2019. Their debut album Corpus Callosum, released in May 2021, showcases a heavier-than-typical symphonic sound that at times veers toward symphonic death metal territory.

Arcane Sanctuary is a symphonic progressive metal band from Rosario, Argentina, built around guitarist and bandleader Francisco Romero alongside vocalist Juliana Penacino, bassist Luciano Vittone, and drummer Jeremías Scoccimarro. The band released their debut full-length album "The Traveler's Diary" in August 2025, a nine-track record described as a journey through human emotions, time, life, and death. Their music fuses the complexity of progressive metal with orchestral and symphonic arrangements, making them one of Argentina's emerging acts in the genre.

Arcanen (originally active as Arkanen from 2003 to 2009) was a melodic death metal band from Antofagasta, Chile. The five-piece lineup featured Gonzalo Jara on vocals, César Aranda on bass, Eduardo Cuadra on guitar, Javier López on guitar and vocals, and Víctor Gutiérrez on drums. The band released the six-track EP Points of Projection in 2006, drawing comparisons to Swedish melodic death metal acts such as Dark Tranquillity and At the Gates.

Arcania is an epic and atmospheric black metal band from Poços de Caldas, Minas Gerais, Brazil, formed in 2013. The band draws on themes of fantasy, nature, and landscapes, and released the album A World Forsaken in 2023 under the Bandcamp handle arcaniaepicbm.

Arcanjo is a Christian thrash metal band from Brasília, Distrito Federal, Brazil, with origins tracing back to 1994. The band's lyrical themes center on Christianity, perseverance, and redemption, and they released a split with Soul Factor in 2001 before a period of inactivity and subsequent reformation.

Architeuthis Dux is a death-grind band from Mar del Plata, Argentina, featuring Chela on vocals, Blass on guitar, Pitu on bass, and Joaco on drums. The band has built an extensive catalog of recordings, including releases such as "Apotheosis of the Guillotine", "Acropolis", "Hecatomb", and a split with Indonesian band Jeritan. Named after the scientific designation for the giant squid, they are one of the most prolific acts in the Argentine extreme metal underground.

Archityrants is an epic doom metal band from Curitiba, Paraná, Brazil, emerging from the earlier project A Tribute to the Plague (1998–2007) before reforming under their current name. The band has released several recordings including the debut album Black Water Revelation (2011) and the EP Sleep of the Damned (2016), crafting lengthy, melancholic compositions built around themes of darkness and sorrow.

Archtype is a power metal band from São Paulo, Brazil, formed in 2013, carrying forward influences rooted in the classic Brazilian power metal tradition. Their lyrical themes revolve around esotericism and prophecy, setting them apart from the more fantasy-oriented peers in the genre. The band emerged partly from the lineage of earlier São Paulo acts and has remained active on the underground circuit.

Ardid is a thrash metal band from the Florencio Varela area of Buenos Aires province, with a lineup including Marcelo Lopez on vocals and bass, Jorge "Costra" García on guitar, and Ricardo "Ricky" Rodriguez on drums. The band completed their album "Mundo en coma" in 2023, presenting it live at Zadar Club in Wilde. Their material draws on classic thrash influences while addressing themes rooted in the working-class neighborhoods of the southern Buenos Aires conurbano.