Father's Face was a progressive and heavy metal quintet from Rio Grande do Sul, Brazil, originally conceived by guitarist and vocalist Alessandro Marques. The band set out to craft conceptual albums inspired by classic horror literature, with their first project drawing from Mary Shelley's Frankenstein. Their discography includes Herald of the End and Soundtrack for a Closing Light before the band split up.

Faustino sin Cuello is a death metal band from Santiago, Chile, active since at least 2009 when they recorded their initial demos drawing on Chilean folklore and history for thematic material. The band released the single Faustino: El Degollado in 2012 and returned with the single Renacer in 2025.

Febre do Rato was a crossover/thrash metal band from Santa Isabel, Brazil, active from around 2014 until splitting up. The band released a demo alongside the EP Mundo Em Extinção and the single Maníaco, playing fast, aggressive material in the Brazilian crossover tradition. Their output was self-released through Bandcamp.

Fecal Devastation is a grindcore/death metal band from Itabira, Minas Gerais, Brazil, formed in 2004 and active across multiple periods. The band released the demo Síndrome de Diarréia and the full-length Depravação Moralista, and compiled their recordings on the retrospective The Rotten Collection — Fecal Devastation Discography 2004–2021 via Italian label Olivia Records. They have appeared on numerous international compilations addressing themes of social criticism and politics through a noise-saturated grind lens.

Feel the Knife is a thrash metal band from Buenos Aires formed in 2018, comprising Facundo Solano on bass and vocals, Damian Dearmas on guitar, and Gustavo Quiroga on drums, with lyrics rooted in 1980s horror, science fiction, and dark rituals. The band has released four records: "Stab Your Back" (July 2019), "Let There Be Death" (October 2021), "Demo Advance" (June 2023), and "So Raw...So Nasty...So Hideous" (May 2024), the last of which was reviewed by Metal Forces Magazine.

Feios is a one-man raw black metal project from Catanduva, São Paulo, Brazil, formed and launched in 2023 by multi-instrumentalist Billy Grind, who handles all instruments, vocals, logo design, mixing, and mastering. The project debuted with the EP Fuck It, We're All Ugly and When We Die We Go to the Same Shitty Hole, HaHaHa (April 2023), a four-track release drawing on personal experience and dark humour. Released through Podreira Records, the EP exemplifies lo-fi Brazilian raw black metal with a self-deprecating edge.

Feios Sujos e Malvados is a groove/thrash metal band from Marabá, Pará, Brazil, formed in 2013 and known for acidic, politically charged lyrics blending crossover and hardcore aggression. The band released their debut album Tortura in 2016 through Legacy Studio in Belém, followed by Crime & Castigo, their second full-length. Founding members include vocalist Noriel Biscoito, guitarist Geraldo Capilé, bassist Mauro Cavera, and drummer Henrique Aranha; the band has shared stages with established acts including Torture Squad and Nervo Chaos.

Feitiço Oculto is a black/speed metal band from Osasco, São Paulo, Brazil, formed in 2019 and self-releasing through Bandcamp. The band's 2022 EP Condenados da Terra, recorded at Manillar studio, presents four tracks whose lyrics draw on class struggle, racial identity, and social inequality from the perspective of economic and cultural minorities. A follow-up release, O Despertar, appeared in 2025, cementing their place in the São Paulo underground.

Fenece is a post-black metal project from Buenos Aires that self-records and self-produces, drawing on the blackgaze of Altar of Plagues, Deafheaven, and Celeste to explore themes of consciousness, death, and institutional dogma. The project released its self-titled debut in May 2018, followed by the EP "Distracción, Anclaje" in October 2020, the full-length "Inercia. Abandono. Renuncia." in May 2023, and "Hacia la oscuridad eterna" in April 2025.