Hairetikos is a black metal band from Moreno, Buenos Aires, formed in 2024, comprising vocalist Nestor, guitarist Alex, bassist Juan, and drummer Guido. Their debut EP L'eremita, recorded and mastered by Eduardo Casella at Estudio En La Nada in Moreno during winter 2024, was released on December 15, 2024, through La Resistencia Distro, and features seven tracks including Transmigración Cósmica and La Consagracion del Temor.

Haitón del Guarataro is a one-man black/doom metal project from Buenos Aires created by Alexis Uribe in 2024, drawing exclusively on Latin American folklore — myths, legends, and spectral figures — as lyrical subject matter. Uribe self-handled all instrumentation, production, and artwork on the debut Fathomage Chants (August 2024), which explored Venezuelan legends, and the follow-up Pombero (May 2025), a five-track conceptual work centered on the Guaraní mythological creature of the same name.

Halahache is a stoner metal trio from Santiago, Chile who describe their sound as centered on fuzz, doom, and attitude. The band contributed a track to the 2021 compilation "Doomed & Stoned in Chile" and have released original material including their "Demo I" on Bandcamp.

Halfdream is an instrumental progressive post-metal project founded by guitarist Marcelo Murata in São Paulo, Brazil, around 2012–2013. The band blends heavy metal riffing and extended guitar work with atmospheric post-rock passages and piano, as showcased on their 2014 release Kaleidoscope. The lineup also includes guitarist Bruno Cabral, bassist Vitor Nishikiori, and drummer Caio Pavanelli.

Hall of Gods is a neoclassical heavy metal project founded by São Paulo multi-instrumentalist Rafael Agostino, also known for his work with Armored Dawn. The project released its debut album A Tribute to the Gods of Music in 2025 through Abigail Records, featuring heavy metal reinterpretations of works by composers including Beethoven, Bach, Mozart, Grieg, and Carlos Gomes. The album features guest vocalists Zak Stevens, Ralf Scheepers, Ronnie Romero, and Snowy Shaw, among others.

Hamen is a symphonic power metal band from Joinville, Santa Catarina, Brazil, formed in 2014, fronted by vocalist Monica Hamen alongside guitarist Cadu Puccini. The band gained international exposure through inclusion on the Terrorizer magazine Fear Candy Latin America compilation and the Imperative Music Volume XVI DVD. Signed to MS Metal Records, their science fiction-themed approach places them among the more melodically ambitious acts in Brazil's southern metal scene.

Hammathaz is a metalcore and melodic death metal band from Sorocaba, São Paulo, Brazil, active since 2011. The band released their debut full-length, The One, in 2020 — a nine-track album recorded at Estúdio Fusão in Cotia and produced by Thiago Bianchi (known for his work with Noturnall and Shaman) — following earlier releases including the EP Inner Walls. Drawing on influences from In Flames, Killswitch Engage, and Sepultura, the band blends technically driven riffing with melodic hooks across their independent catalog.

Hammergoat is a bestial death/black metal band from São Paulo, Brazil, featuring members associated with the Brazilian underground acts Evil and Dethroned Christ. The band released their debut full-length, Regeneration Through Depopulation..., in 2010 on Hammer of Damnation, a 30-minute assault drawing comparisons to Blasphemy and Hellhammer and including a cover of Sarcófago's "The Black Vomit." They also appeared on a split cassette with Swiss act Dakhma, released in 2018.

Hammerlin is a power metal project from Rosario, Santa Fe, led by Marcos Cápula. The project's debut full-length, La Sombra de la Luna, was released in November 2022 as an independently produced home recording, comprising 11 tracks across 51 minutes of melodic heavy metal.