HumanMeatGrinder was a one-man goregrind and crossover project from Barretos, São Paulo, formed in 2021 by Rafael Douglas. The project blended death metal and grindcore with politically and socially charged Portuguese-language lyrics, debuting with the EP Matadouro (December 2021), recorded at home with limited resources. A second release, Instrumento, followed before the project dissolved.

Hunger is a thrash metal band from Indaiatuba, São Paulo, founded by vocalist and guitarist Mauro Izalbert with the intent of pairing politically engaged lyrics with aggressive thrash riffs. The band released their debut full-length Hunger Feeds Misery in 2020, featuring tracks such as "Peace Is in Pieces" and "The Dead Are Not Afraid to Die", produced at Boomer Studio in Indaiatuba. The lineup on that record included Mateus Marini on guitar, Israel Santana on drums, and Tom Wolphy on bass.

Huszar is a one-man progressive post-black metal and ambient project from San Antonio de Padua, Buenos Aires Province, Argentina, formed in 2015. The project released the full-length "Los Nuevos Absolutos De Todos Los Días Quemados" in October 2016 and its sequel "Los Nuevos Absolutos: Acto Segundo" in February 2017, and also contributed to a split release with Youth Against Christ in 2017.

Hutt is a grindcore and death-thrash trio from São Paulo formed in 2002, comprising Appezzato on vocals, Leandro on guitar, and André on drums, with the band name taken from Jabba the Hutt of Star Wars. The band has built a discography spanning six releases, including the albums Horror³, Monstruario, Apocalipster (2017, via Black Hole Productions), and Maldicto (2019), all featuring short, ferocious songs with Portuguese lyrics addressing social themes. Their sound draws on classic grindcore acts such as Napalm Death alongside death metal influences in the vein of Morbid Angel.

Huvala is a one-person stoner and sludge metal project from Bahia, Brazil, formed in 2017 under the sole hand of the musician known as Putrefactus, who handles all instruments, vocals, and mixing. The debut release Sirens of Souls (September 2017) consists of two lengthy, atmosphere-heavy tracks — "The Oathbreaker" (11 minutes) and "Sepulcher of the Bride" (9 minutes) — drawing from doom, atmospheric black metal, and sludge. The project's name is a stylized play on the geological term uvala, with the added H described by the artist as purely aesthetic.

Hydria was a symphonic metal duo from Rio de Janeiro formed in 2008, centred on vocalist Raquel Schüler and guitarist, composer, and producer Celo Oliveira. Their self-funded debut album Mirror of Tears (2008) earned the band opening slots for Within Temptation and Tarja Turunen on their 2008 Brazilian tours, significantly raising the band's profile. Hydria continued with Poison Paradise, the acoustic collection Acústico — The Acoustic Sessions (2011), and Freakshow (2013) before splitting up that same year.

Hyedrah is a heavy and power metal band from Buenos Aires, Argentina, whose core members have included guitarist and keyboardist Leónidas Vera Janavel, drummer Christian Montes, and bassist Adolfo Arbelaez. The band released their debut full-length "Rompiendo el Silencio" in June 2015 and followed it with the EP "Fuego en la Oscuridad" in November 2016.

Hylidae is a death and thrash metal band from Rio Branco, Acre — one of Brazil's most geographically remote metal acts — whose band name is drawn from an indigenous Amazonian ritual associated with hunting and survival. The band released their debut full-length Promiscuous World (2012), recording it in Curitiba due to the lack of suitable studios in Acre, and followed it with the second album Unbreakable Curse (2021), mixed and mastered in Fortaleza. Over their career they have shared stages with Sepultura, Nervochaos, and Demonical.

Hyon is a heavy/power metal band from El Tigre, Anzoátegui, Venezuela, active since 2008. The band released a demo titled "Versos de rencor" in 2010, followed by the singles "Obtener la victoria" (2012) and "El príncipe celestial" (2013), the latter exploring themes of divine protection and salvation. They operate as an independent act and feature a five-piece lineup drawn partly from members of other Venezuelan metal outfits.