Havoc is a black metal band from Lages, Santa Catarina, Brazil, formed in 2001. The band's lyrical themes revolve around Satanism, death, destruction, and the apocalypse, rooted in the darker traditions of the genre. After early demos in 2003 and 2004, they released their full-length debut Icon of Destruction: Atrocity Divine in 2007.

Hawake is a progressive metal band from Manaus, Amazonas, Brazil, formed in 2018. The band blends intricate guitar work, keyboards, and dynamic vocals into an expansive progressive metal sound, and has performed as a support act for Angra in their hometown. Their debut release Duality of the Universe established them as a notable presence in the Brazilian progressive metal scene.

Hawthorn was a symphonic black metal band from Curitiba, Paraná, Brazil that operated under the Christian black metal (unblack) banner. The female-fronted group wove Scandinavian-influenced melodic extremity with symphonic arrangements, releasing material including the EP Thorns and Blood and the full-length Dark Tales. The band was later signed to Intense Millennium Records before splitting up.

Hazeroth is a Christian black metal (unblack metal) band from Santa Maria, Rio Grande do Sul, Brazil, active since 2013 in their current incarnation. The band occupies a distinct space within the Brazilian black metal underground, combining raw, aggressive black metal with explicitly Christian lyrical themes. Their discography includes the album Arsenal and the 2013 release Mene Mene Tequel Ufarsim, the latter issued as a limited edition of 200 copies.

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.

HDLNKGS was a raw black metal project from Ponta Grossa, Paraná, active from 2018 until their split-up. The project released the EP Pone Diabolus Custodiam in May 2022, a three-track independent digital release documenting their stripped-down, lo-fi approach to Brazilian black metal.

Headthrashers is a thrash metal band from Cascavel, Paraná, playing aggressive, politically charged metal with an explicitly anti-fascist stance. The band has released albums including Insurreição and Campos de Batalha, channeling the raw energy of classic speed and thrash metal from within Brazil's southern underground scene.

Headwolf is a melodic death metal band founded in Teresina, Piauí, with founding members including vocalist Marcelo Abreu, lead guitarist Adriano Theo, and drummer Alex Fernando. Their lyrics draw on Nordic culture and mythology, and the band released the EP The Lost Warriors as part of their mission to bring fresh approaches to Brazil's underground metal community.

Heaven Steel is a heavy/power metal band from Santa Maria da Vitória, Bahia, formed in 2014, operating as an independent act with themes spanning Christianity, science fiction, and geopolitical conflict. Their album Hanoc (2017) is a nine-track release that exemplifies the band's dual focus on traditional power metal songwriting and conceptual lyrical content. They also released earlier works including Nuclear Desaster (2016) and Dreams for a New World (2016).