Hefesto is a Buenos Aires heavy metal band that built their debut around the concept of the seven deadly sins, releasing a series of singles — Ira and Avaricia in 2022, Soberbia and Envidia in 2023 — culminating in the full-length debut Pecados Capitales in 2026. Vocalist Jaime described the project as reinterpreting Dante's framework through a contemporary lens, treating the sins not as moral condemnations but as expressions inherent to human nature. The band is active on Spotify with around 95 monthly listeners and 179 followers.

Heksabort is a progressive black metal band from Bahía Blanca, Argentina, active since 2012. Their 2012 full-length "Black Mambo" blends experimental and alternative black metal across ten tracks, drawing comparisons to bands operating at the intersection of black metal and avant-garde rock.

Helker is a heavy/power metal band from Buenos Aires founded by guitarist Mariano Ríos and featuring vocalist Diego Valdez, widely regarded as one of Argentina's premier metal exports. The band released three Spanish-language albums — "Legado Secreto" (2001), "Resistir" (2008), and "A.D.N." (2010) — before signing with Germany's AFM Records for their English-language debut "Somewhere in the Circle" (2013) and "Firesoul" (2017), touring alongside Primal Fear, HammerFall, and Gamma Ray.

Hell Chaser is a thrash/death metal band from Belo Horizonte, Minas Gerais, Brazil, formed in 2017. The band features Victor Ogurot Paiva on vocals and guitars, André Vasconcellos on guitars, Rafael Paim on bass, and Lucas Alexandre on drums. Their release Belo Horizonte: Cidade Porrada, listed on Metal Archives, reflects the aggressive thrash energy of the city's underground metal scene.

Hell Poison is a one-man speed/black metal project from Teresina, Piauí, Brazil, created by the musician known as Deathhammer in 2015. The project draws heavily on Motörhead, Venom, Hellhammer, and Bathory, delivering raw and aggressive material across a prolific run of releases including Speed Metal Burns Your Mind (2017), Speedfreak Demons (2020), and Breathing for the Filth (2021). Hell Poison is distributed through Metal Scrap Records and has also appeared on a split with Brazilian band Thundertank.

HellArise is a female-fronted thrash and death metal band from São Paulo, Brazil, active since 2012. The band released the EP Functional Disorder in 2013, recorded at Estúdio Pedrada in São Paulo, earning recognition as one of the standout debuts on the Brazilian underground scene that year. Their subsequent releases, including More Mindless Violence and Human Disgrace, are available on Bandcamp and showcase a sound that moves between heavy, thrash, and death metal.

Hellbanger is a death/black/thrash metal band from Salvador, Bahia, Brazil, formed in 2021 and operating in the tradition of South American satanic speed metal. The band released the EP Satanic Speed in 2021 and followed it with the split album Satanic Speed & Bloody alongside Annihilation in 2023, with Hellbanger's tracks classified on Metal Archives under themes of War, Antichrist, and Death.

Helldog is a thrash metal and crossover band from Palmeira das Missões, Rio Grande do Sul, Brazil, operating under that name since 2015 after previously performing as MadDog from 2010. The band is active in the local scene and has recorded at Estúdio Play in Palmeira das Missões, with their socially themed approach rooted in classic Brazilian thrash and hardcore crossover.

Hellflight is a heavy and thrash metal band from São Paulo, Brazil, formed in 2016. The band released early recordings as Demos 01 and issued the single Mosh Pit Kerosene, establishing themselves as part of the independent São Paulo metal underground.