Horns of Venus were a metalcore and death metal band from São Paulo, Brazil, formed in 2009 and active until their split. They released two full-length albums: "For the Pressure We Bring" (2009) and "We Are Not Buying Your Shit" (2011), the latter recorded at Bimini Studio in Jundiaí and Master Blaster Studios, blending death metal, grindcore, and melodic hardcore influences across 14 tracks.

Horny for Blood were a crossover thrash band from São Paulo, Brazil, formed in 2013. They released the eight-track EP "Vomithrash" in December 2013, a fast-paced collection drawing comparisons to acts like D.R.I. and Brazilian hardcore legends Ratos de Porão, with Portuguese-language songs covering topics ranging from urban life to social commentary.

Horrendum Vermis is a death metal band from Bahía Blanca, Argentina, formed in 2014 by Matias Carrasco (guitar/vocals), Marcos Lacalle (drums), and Diego Genes (bass). They have released four studio albums — Portals to Horrific Pandemonium (2016), Rites of Invocation to the Ancients (2018), Cvlt ov Malignant Entities (2021), and Temple ov Morbid Divinities (2025) — as well as the live album Testimonials of Al-azif (2020).

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.