Horrificia are a grindcore and death metal band from Rio de Janeiro, Brazil, featuring a dual-vocal lineup of Valdo and Marcelo Uchôa alongside guitarist Bruno Moraes, bassist Vinícius Cassemiro, and drummer Erick Fryer. The band released a split with Raped Bitch through Disturbed Mind Records, a UK-based extreme metal label, with the release categorized across grindcore, death metal, goregrind, and noisecore.

Horror Chamber are a death metal band from Canoas, Rio Grande do Sul, Brazil, featuring vocalist/bassist Guilherme Lannig, guitarists Felipe Pujol and Fabricio Bertolozi, and drummer Tiago "Thorvald" Von Groll. The band debuted with the EP "The Devil Has No Face" (2009) and have since released three full-length albums: "Eternal Torment" (2016), "Thoughts: The Slow Decay" (2019), and "With Fire, Despair" (2024), the latter released through Rapture Records.

Horror Face are a death metal band from Jaboatão dos Guararapes, Pernambuco, Brazil, formed in 2012. They released the EP "Brutal Sodomy" in June 2012, a six-track recording produced at Wolf Studio in Pernambuco, featuring tracks such as "Killer Instinct," "Into the Decomposition," and "Breaking Bones with a Crowbar."

Horrorem Memoriæ is a solo atmospheric black metal and dungeon synth project from Minas Gerais, Brazil, formed in 2021. The project releases material entirely in Portuguese and has built a catalog including early demos from 2020–2021 and the album "Fogo e Sangue" (Fire and Blood, 2024), drawing on themes of shadow, memory, and Brazilian folklore within a melodic black metal framework.

Horrorterror is a death metal and grindcore band from Medellín, Colombia. The band released a self-titled EP and participated in multiple splits in 2020, including the four-way split Aberraciones Sonoras and the three-way split Síntoma de un País en Guerra alongside Anger Blast and Rotten Noise.

Hostile Monarch is a melodic black metal band from Guernica, Buenos Aires Province, Argentina, whose lineup has included Gernik on guitars, Consul Praetor on bass and vocals, and Bestial Manipulator on drums. The band released their debut album "The Arrival of Tormentors" in 2015, followed by "Dogmatic Chaos" in 2018.

Hostinalia is an extreme heavy metal band from the Pernambuco metal scene in northeastern Brazil, formed in 2020. The band released the album "Millions of Orphans" alongside singles including "Morbid Anxiety" and "Black Hole", blending melodic black and gothic metal elements.

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).

Hranice Abyss is a death/thrash metal band from São Paulo, Brazil, formed in 2020 by vocalist Vic Ferreira and guitarist Henrique de Fina, with bassist Bruno Nicolozzi and drummer Lucas Coltri rounding out the lineup. The band released their debut EP "Aphagy" in August 2021, a fully self-produced six-track effort that drew comparisons to The Black Dahlia Murder, Necrophagist, and Slayer, earning an 8/10 from Metal Temple. Their DIY approach extended to producing and directing their own music videos, including the singles "Violation of Human Condition" and "Flawless Oblivion".