Forsik was a heavy/stoner metal band from Florianópolis, Santa Catarina, Brazil, formed in 2012, consisting of Marcelo Medonho on guitar and backing vocals, Leandro Vidal on drums, and Afonso Bistura on bass and vocals. The band released the promo Bicho Caveira in 2012 and the album Mundo Sem Luz in 2015, drawing influence from Black Sabbath, Motörhead, and Red Fang.

Fortaleza is a heavy metal band from Posadas, Misiones, Argentina. Their 2011 album "Islas Malvinas," released on June 24 of that year, features the core trio of Horacio Monllor on guitar and vocals, Marcelo Monllor on bass and backing vocals, and Mateo Castillo on drums.

Fosa Común is a death metal band from Puerto Montt, Chile, formed in 2015 and rooted in the dirty, visceral tradition of Autopsy and Grave. Their album "Devorado por la Muerte" was originally issued through Infinito Envenenado in 2021 and reissued on vinyl by Sick Rites Records in 2022, establishing the band as a key act in Puerto Montt's underground death metal scene.

Fossilization is a death/doom metal duo from São Paulo, Brazil, formed around 2020–2021, featuring members also known from the sludge/doom band Jupiterian. The band debuted with the EP He Whose Name Was Long Forgotten in 2021 on Everlasting Spew Records, followed by the full-length Leprous Daylight in 2023 and the sophomore album Advent of Wounds in February 2026, all released through Everlasting Spew.

Fosso is a black metal duo from São Paulo, Brazil, formed in 2021, consisting of Pedro Alves on guitar, bass, and vocals, and Victor Miranda on drums. The band released their debut album Solo Amargo in June 2021, a claustrophobic eight-track record recorded and mixed by the duo between March and April of that year.

Fourkaos is a heavy/thrash/groove metal band from Campina Grande, Paraíba, Brazil, formed in 2019 by vocalist/guitarist Johnny Glaydson, lead guitarist Matheus Oliver, bassist Matheus Henrique, and drummer Rodolfo Diniz. The band released their debut album "Remnants of Sanity" in July 2019, an eight-track record blending thrash aggression with melodic and progressive elements. Their sound draws on multiple strands of heavy metal while maintaining a cohesive identity described as both modern and organic.

Fractura is a thrash metal and hardcore band from Santiago, Chile, formed in 2023 with a lineup of five members including vocalist Rampage and drummer Bastian. The band recorded their debut EP between August and September 2023, releasing it in April 2024 as a five-track statement of aggressive, pit-focused crossover thrash.

Frater is a melodic death metal and metalcore band from Buenos Aires, Argentina, whose discography spans over a decade including "Into the Light" (2012), "Pulso en Eclipse" (2017), and "Sangre y Viento" (2024). Core members Andrés Bori on guitar and vocals and Andrés Zadunaisky on bass have appeared across multiple releases, with Juan Orcajada joining on vocals for the 2024 album.

Fratura is a one-man black metal project from São Paulo, Brazil, created at the end of 2019 by the sole member known as Corposeco. The project channels raw black metal through the lens of crust punk, d-beat, and powerviolence, a hybrid the artist calls "Black-Beat," combining lo-fi sonic violence with antifascist and anarchist themes. The debut album "Corposeco" was released in August 2020 and received a remastered edition in June 2022, which included a cover of Mayhem.