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.

Harllequin is a heavy and power metal band from Brasília, Brazil, that formed in 2005 and has gone through periods of activity and hiatus. The band released the full-length album Hellakin Riders in September 2012, a ten-track record recorded, mixed, and mastered at Broadband Studio in Brasília. Their work appeared on the compilation Brasil Metal Union 2005, establishing them as part of the Brazilian metal underground.

Harpoon is a heavy metal band from José C. Paz, Buenos Aires province, rooted in the tradition of Argentine metal (Metal Argento) shaped by pioneering acts like V8 and Hermética. The band has released three studio albums — Grito de Rabia (1998), Batalla Eterna (2006), and Tu Mismo Pensar (2011) — with a lineup anchored by vocalist Ramón Duré, guitarists Alejandro Burgos and Hernán San Martín, bassist Rafael Florentín, and drummer Daniel López. Batalla Eterna was recorded and mastered at Crazy Rabbit Studios and produced by the band alongside Ariel Ranieri.

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).

Hellish War is a heavy/power metal band from Campinas, São Paulo, Brazil, active since 1995. Their 2001 debut "Defender of Metal" became a cult item in Brazilian traditional metal circles, with German fans citing it among the finest Brazilian heavy metal albums of its era. Their 2019 album "Wine of Gods" features a guest appearance by Chris Boltendahl of German act Grave Digger on the track "Warbringer".

Helltern is a heavy/power metal band from Curitiba, Brazil, formed in November 2019 and named after a German word meaning "enlightened." Their debut album "A World Without Mercy" (2021), recorded at Funds House Studio and produced by Aly Fioren, draws on the musical lineage of Judas Priest, Iron Maiden, and Dio while addressing themes including World War II, the Holodomor, and the pandemic.

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.