Adaia is a power metal band from Cartago, Valle del Cauca, Colombia, formed in 2011 by guitarist Jorge Soto, vocalist Cristian Badillo, and drummer Jaime Guzmán. The band crafts melodic heavy metal centered on themes of freedom, hope, death, and love, drawing on the classic power metal influences the members grew up with. They operate as an independent act and released early material including the 2013 single "Muerto en Vida."

Adamah is a Christian heavy metal band from Carapicuíba, São Paulo, Brazil, founded in 2014 as a project by guitarist and composer Marcos Siqueira and vocalist Alex Souza. The band channels traditional heavy metal songwriting with lyrical themes drawn from faith, delivering driving riffs and melodic hooks.

Addam's Nightmare is a progressive and melodic metal band from Buenos Aires, Argentina, founded in 2014 by guitarist Reaper O'Brian, later joined by Fear Monta on bass and Nico Granatera on drums. The band released their debut EP "Halloween For All" in November 2014, a four-track release that established their blend of progressive arrangements with melodic heaviness. What began as a conceptual side project quickly solidified into a fully active band within the Buenos Aires underground scene.

Addicted to Pain was a heavy metal and hard rock band from São Paulo, Brazil, led by vocalist and keyboardist João Paulo Pretti and featuring a lineup with ties to prominent Brazilian acts including Warrel Dane's touring band, Noturnall, Shadowside, and Seventh Seal. Their debut EP "Queen of All Lies" was produced at Norcal Studios in São Paulo, with keyboardist Juninho Carelli of Noturnall guesting on the lead single "The Kings Never Die".

Aderiva is a crossover heavy metal band from Fortaleza, Ceará, Brazil, blending hardcore and heavy metal in a style rooted in the northeastern Brazilian underground rock scene. Active since 1999 in various forms and revived under the Aderiva name around 2015–2016, the band released the EP "Vida Longa e Próspera" in 2016 and the full-length "Auto Evolução", the latter celebrating 20 years of the group's history.

Adrammelech is a black metal horde from Joinville, Santa Catarina, Brazil, formed in 2018 and oriented around themes of primordial gnosis, war, and Hyperborean mysticism. The five-piece — operating under pseudonyms including Masterwolf, Daswolf, Hades, and Terror — released a self-titled demo in 2018 on Battlefront Distro.

Adriano Arguelho is a shred and heavy metal guitarist from Campo Grande, Mato Grosso do Sul, Brazil, operating as a solo project since 2022. Drawing on the tradition of Brazilian instrumental guitar, the project emphasizes technical, high-speed fretwork rooted in heavy metal.

Adumbrall is a black/death metal solo project from Euclides da Cunha, Bahia, Brazil, formed in 2020 by Athayde Neto, who also plays in the band Wiseblood. A one-man operation, Neto handles all instruments, vocals, and lyrics, channeling themes of nature, philosophy, enlightenment, horror, and lust across releases including "Through Passion, Through Pain, Through Blood" and "In a Blaze of Order."

Adversæ is a post-black metal and atmospheric black metal project from Rosario, Santa Fe, Argentina, that composed, recorded, mixed, and mastered its debut self-titled album entirely in Rosario in 2022. Released on August 6, 2022, the record's five tracks — including the ten-minute opener "Ouroboros" and "Enemy of Man" — blend black metal aggression with shoegaze textures and post-rock dynamics. The project describes its music as "an interpretation of the path of humans in the universe," grounding its sonic ambition in a philosophical framework.