Hex Crow is a heavy/speed metal power trio from Bucaramanga, Colombia, founded in late 2015 by Daniel Mantilla, Felipe Ortega, and Sebastián López, all veterans of local bands including Hatred and Perjurio. The band released their debut demo Demons, Witches & Loud Noises before issuing the full-length Forward to the Past in December 2019, a limited cassette release through Vermin Records and All For One Heavy Metal United. Their sound blends the raw power of traditional heavy metal with relentless speed metal energy.

Hexagram is a death/thrash metal band from Batuco, in the Santiago metropolitan area of Chile. The band is unsigned and independent, with lyrical themes centered on religion, death, and slaughter.

Hexen Sabbat is a dark doom metal band from Rio de Janeiro, Brazil, formed in 2024. The band released their debut album Dramatic Dreams on April 11, 2024, through Eclipsys Lunarys Productions, recorded at HR Studio and Pré-Sound Studio with production by Orion Gobath and David Malkuth. Their sound blends slow, heavy doom textures with occult and melancholic themes.

Hexenshade is a solo black metal and dungeon synth project from Santa Fe, Argentina, founded in 2024 by the artist known as Woryon. The debut album "The Revelation of Doom..." was recorded in January 2025 in Santa Fe and released as a limited cassette by Dutch label Wolfkult Religion, drawing heavily on early Bathory in its raw, occult approach.

Hexerei is a raw black/death metal project from Valdivia, Chile, formed in early 2018 under the banner Kult der Hexerei by Spectre of the Blood Moon. The band released a self-produced demo in February 2019, followed by the split "Hexed Winds of Darkness" (2020) through Infernal Death Productions, and a 2024 career-spanning compilation on Iron, Blood and Death Corporation; their sound draws comparisons to Archgoat and Beherit, built around high-speed blasting, tremolo riffing, and occult, anti-Christian themes.

Hibria is a power/speed metal band from Porto Alegre, Rio Grande do Sul, Brazil, formed in 1996 and internationally recognized for their technical precision and ferocious tempo. Their debut album Defying the Rules (2004), mixed by Piet Sielck of Iron Savior, was released in Japan where it found a devoted following, and the band went on to support acts including Metallica and Black Sabbath. Subsequent albums include The Skull Collectors (2008), Blind Ride (2011), Silent Revenge (2013), and the self-titled Hibria (2015).

Hicsos is a thrash metal band from Rio de Janeiro, Brazil, founded in 1990 and one of the city's longest-running acts in the underground scene. Their sound fuses thrash with hardcore, addressing themes of religion, politics, and social conflict, and they have documented their run with albums including Eatin' Concrete (2004), Technologic Pain (2007), and Circle of Violence (2011), the last of which was re-released in 2018 with a DVD documentary titled 26 Years of Thrash Violence. The band is signed to Metal Blast Records and remains active.

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."

Dementiae is a black metal band from Santiago, Chile, whose members perform under the names Satanya, Draco, and Demonamorthus. Their debut demo Between Dementia and Death, released through Pagan Forest Records and Black Crusade Productions in a limited edition of 100 CD copies, draws on the atmospheric and depressive currents of early Burzum alongside elements of doom metal.