Harppia is a heavy metal institution from São Paulo, Brazil, tracing their roots to 1982 when vocalist Jack Santiago and guitarist Hélcio Aguirra formed the precursor band Via-Láctea, officially adopting the Harppia name in 1983 in tribute to the harpy eagle. Their 1985 debut EP A Ferro e Fogo, released on Baratos Afins, is widely considered one of the first heavy metal EPs of its style recorded in Brazil, with the track Salém (A Cidade das Bruxas) becoming a Brazilian metal anthem. In 2008, the band performed before more than 50,000 people at São Paulo's Virada Cultural in celebration of their 25th anniversary.

HateFall is a heavy metal band from Curitiba, Paraná, Brazil, formed in 2011. The band released their debut EP Light & Fire in February 2018, a seven-track release that established their traditional heavy metal sound and was followed by work toward a planned debut full-length.

Hazy Hamlet is a traditional heavy metal band from Maringá, Paraná, formed in 1999, drawing heavily from classic 1970s and 1980s acts such as Iron Maiden, Judas Priest, and Grave Digger. Their debut full-length Forging Metal (2009) earned international distribution across the USA, Europe, and Japan, and was named best album of 2009 by the All the Bangers webzine. They followed it with Full Throttle (2013) on Arthorium Records, cementing their reputation as one of the more dedicated purists in Brazil's underground heavy metal scene.

Heavy Smasher is a traditional heavy metal band from Fortaleza, Ceará, Brazil, formed in 2018. The quartet — featuring Nildo Gomes on vocals, Nando Smasher and Diego Quântico on guitars, and Luís Paulo on bass — debuted with the EP Smasher And Loud in 2018 before releasing their self-titled full-length album in 2021, recorded at VTM Studio in Fortaleza. Drawing on classic influences including Dio, Iron Maiden, and Judas Priest, the band pursues a sound rooted in the NWOBHM tradition.

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.

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.

Hellhoundz is a heavy metal band from Fortaleza, Brazil, formed with the stated goal of producing original music rooted in the New Wave of British Heavy Metal tradition, citing influences including Iron Maiden, Judas Priest, and Saxon. The band released a self-titled EP in 2018 and followed it with the debut full-length album The Battle of the Somme in December 2019, which received international attention and was made available on Bandcamp and Spotify.

Hellway Patrol is a heavy/thrash metal power trio from Londrina, Paraná, Brazil, formed in 2017 by vocalist and bassist Ricardo Pigatto, guitarist Thiago Franzim, and drummer João Bolognini. The band crafts post-apocalyptic and dystopian-themed metal, releasing the EP "Desert Ghost" in June 2018, followed by their self-titled EP.

Hellway Train is a hard rock and traditional heavy metal band from Belo Horizonte, Minas Gerais, Brazil, relaunched in 2020 by founders Marc Hellway and Vinicius Thram with a renewed focus on classic 1980s heavy metal sounds. The band released the EP "Lockdown Reborn" in November 2020 and their debut full-length album "Borderline" in 2024 via Classic Metal Records.