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.

Fenrir's Scar is a gothic metal duo from Campinas, São Paulo, Brazil, formed in 2015 by André Baida and Desireé Rezende, blending heavy metal with gothic and alternative metal influences. The band released a self-titled debut album in October 2017, produced by Fabiano Negri and co-produced by Ric Palma at Minster Studios in Campinas, to positive reception from the Brazilian metal press. Subsequent releases include the albums The Enemy Inside, Curse of Mankind, and LOVE | HATE | HOPE | DESPAIR (2023), establishing the duo as consistent contributors to the Brazilian gothic metal underground.

Feretral is a black metal band from Duque de Caxias, Rio de Janeiro, Brazil, formed in 2020. The band brands their sound "Sewer Metal" and features members performing under pseudonyms including Bestial Vomit, Deoarsprofanum, Hell S., and Splatter. Their 2021 release The Temple Ov Feretral, a limited cassette edition of 150 hand-numbered copies, collects 17 tracks of raw, lo-fi black metal alongside covers of Darkthrone and Sepultura.

Feretri is a black/doom metal project from Melipilla, Chile that released the demo "In Sepulcro" in 2024, featuring five tracks recorded in a home studio in January 2021. The material leans into funereal doom aesthetics, with track titles like "Catalepsia," "Tétrica Liturgia," and "Funeral Nocturno" anchoring the release in death-obsessed, slow-burning darkness.