Forget My Pain is a gothic metal band from Buenos Aires, Argentina, who released their debut demo "Prelude To The Darkness" in April 2011 and followed it with the "Moonless" EP in March 2015. The band's lineup on "Moonless" featured Natty on vocals, Alexei on guitars, Viruz on bass, Eggu on keyboards, and Kiri on drums.

Forgotten Rites is a black metal band from Buenos Aires, Argentina, formed in 2025. Their debut release, the three-track demo "Time Before Time," appeared in April 2025 and established the band in the Buenos Aires underground black metal scene.

Forgotten Krypt was a one-man black/thrash/punk project from Uberlândia, Minas Gerais, Brazil, formed in 2014 under the alias Ensamhet. The project's self-titled demo, released on November 20, 2014 through Podreira Records on CD-R, included original tracks alongside a Darkthrone cover and drew influence from Darkthrone, Venom, Toxic Holocaust, and Burzum.

Forgotten Rites is a black metal band from Buenos Aires, Argentina, formed in 2025. Their debut release, the three-track demo "Time Before Time," appeared in April 2025 and established the band in the Buenos Aires underground black metal scene.

Fork of Horripilation is a two-piece black metal band from São Paulo, Brazil, consisting of Liz deSade on vocals and Mario Albino on instruments and vocals, formed in 2022. The duo has released a prolific catalog including the Canti Eretici-released album Folguedo Noturno (2023) and the full-length Mística (2023), drawing on themes of history, paganism, and introspection.

Forkill is a thrash metal band from Rio de Janeiro, Brazil, formed in 2010, drawing influence from Exodus, Testament, Sepultura, and Slayer. The band released their debut album Breathing Hate in 2013, produced by Robertinho do Recife, and followed it with the album Sick Society, recorded at Tellus Studio with producer Daniel Escobar.

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.