Heavenly Kingdom is a heavy/thrash metal band from Cubatão, São Paulo, Brazil. The band's lineup includes Brenno Lima, Leandro Dias, Vagner Mesquita, and Bruno Conrado, and their discography spans multiple full-length albums including Tears From The Sky, Nature In Fury, and Slave Of Time, released through Heaven's Music.

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.

Hecate is a black metal band from Fortaleza, Ceará, Brazil, whose lineup features vocalist Lord Thanatos, guitarist Pagan Priestess, drummer Daymon, and bassist Misantropico Herege. The band released the full-length album Odes ao Oculto in 2003 and the EP V.I.T.R.I.O.L. in 2014, with lyrical themes centered on paganism, occultism, and satanism. They are signed to Sphera Noctis Records.

Hedendom is a pagan raw black metal project from Buenos Aires, driven by vocalist and lyricist Javert Nihil with session guitar and bass contributions from Gon Rillo. The project released its self-titled demo in 2015 — a four-track cassette featuring songs including "The Shadows," "Whisper in the Night," and "Spectral Fall" — which was distributed physically through Triumphant Cadaver Label in Sweden. Javert Nihil has run multiple one-person projects since 2010, with Hedendom as the primary black metal outlet.

Hedenskrig was a Viking and pagan black metal band from Santiago, Chile, formed in 2003 and driven by themes of Norse mythology, war, and ancient legends. The band recorded a demo series in 2003 and 2004 and later released the "Warsongs" demo in 2013, featuring tracks such as "Warsong," "Ambush in the Woods," and "Odin Calls to War."

Hedor is a brutal death metal band from Ibagué, Tolima, Colombia, active since 2004 and signed to Mutilated Records. Their debut EP Xenofobia arrived in 2009, showcasing a two-piece assault built around dominant riff intensity and relentless drum blasts, drawing comparisons to Colombian extremists Internal Suffering. Lyrically, the band tackles themes of human behavior, confrontations for power, and a crisis of national identity.

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.