Hernán Cirigliano is a guitarist and composer from Hurlingham, Argentina who self-produces his progressive and heavy metal recordings, handling guitars, keyboards, and drum programming. His 2019 album "Tormenta Solar" features a keyboard solo by Dream Theater's Derek Sherinian on the track "El Dato Sería Clave," with bass, mixing, and mastering handled by Marco Ignacio Toba.

Hess is a traditional heavy metal band from Rosario, Argentina led by vocalist Melani Hess, who originally formed the project in 2010 as a tribute to classic acts such as Black Sabbath, Iron Maiden, and Judas Priest. The band released their debut album "Hagalaz" in October 2014, followed by the full-length "Harpokrates" in 2019, with the current lineup also featuring guitarist Ariel Schefer and lead guitarist Diego Schmidhalter.

Hevilan is a heavy/symphonic metal band from São Paulo, Brazil, founded by guitarist Johnny Moraes. Their debut album The End of Time was released in 2013 in Brazil and Japan, and later picked up by Massacre Records for a European release in 2015, earning the band spots opening for Masterplan and Edu Falaschi. A second full-length, Symphony of Good and Evil, followed in 2021.

Hidrommel is a heavy metal band from Lavras, Brazil, formed in 2022. The band released their debut album We Are the Seas in 2024, a ten-track record that draws on classic heavy metal traditions with a seafaring lyrical theme spanning tracks such as "Pirates of 21st Century," "Sirena's Call," and "Natural Born Drinkers."

Holder of Souls is a heavy metal band from Bragança Paulista, São Paulo, Brazil, formed in 2019. The band's lineup includes Daniel Bueno on vocals, Tiago Schievenin and Rafael Cintra on guitars, Emerson Paulo on bass, and Daniel Franco on drums. They released their self-titled debut album in September 2019, a nine-track effort spanning just under 52 minutes.

Howenh is an instrumental heavy metal project from the Santiago metropolitan area of Chile, founded in 2015 by guitarist and composer Iván Aguayo. The band blends doom, dark wave, and post-rock into an atmospheric, largely instrumental sound, documented across two albums: Kren (2015) and Sheol (2018).

Humanicidio was a thrash and heavy metal band from Rosario, Argentina, whose lineup included David Sanchez on guitar and vocals, Nicolás Sanchez on lead guitar, Franco Mena on bass, and Diego Forteaga on drums. The band released a four-track demo in May 2016 and a self-titled album in 2018 before splitting up.

Hëiligen is a traditional heavy metal band from Santiago, Chile, formed in the mid-2010s with a mission to carry forward the legacy of 1980s heavy metal in the style of Iron Maiden and Judas Priest. The band released the EP "Return to the Battle" before issuing their debut full-length "Shadows in the Church" in 2020 through Tradition Metálica Records, with lyrics addressing cosmology and critiquing organized religion.

Hënkel is a heavy metal band from Villa Mercedes, San Luis, Argentina, active since around 2010 and known for their 2011 demo "Cerca del Final". Their debut album "Génesis", recorded between October 2018 and March 2020 with drums and vocals tracked at Estudio DAB in Villa Mercedes, was released in 2021.