Fallen Idol is a heavy/doom metal trio from Arujá, São Paulo, consisting of Rodrigo Sitta (guitars, vocals), Márcio Silva (bass), and Ulisses Campos (drums). The band has released four full-length albums, including Mourn the Earth (2018) and Weed and Black Candles (2024), the latter self-produced by Sitta with a guest cello appearance by Cielinszka Wielewski. They have also paid tribute to their influences with releases honoring Cirith Ungol (2019) and Black Sabbath (2020).

Fantasma is a doom metal band from Dourados, Mato Grosso do Sul, Brazil. Their 2021 demo Drogma featured a lineup of Zumbi on vocals, Vênus on guitar and bass, Hellvuncan on keyboards, and Phantasmagoria on drums, and was recorded at Estúdio Tereré and released through Dark Abyss Records.

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.

Flor de Fumo is a psychedelic stoner doom trio from Londrina, Paraná, Brazil, formed by Gabriel Lemes (guitar/vocals), Rafael Camacho (bass), and Tiago Garcia (drums). The band blends South American psychedelia with the ritualistic density of doom metal, delivering a raw, analog sound they describe as smoke-soaked and ritualistic. They released their self-titled debut EP on December 12, 2025, featuring five tracks including "Doom And High," "Smoke And Sex," and "Erva Blues."

Fohatt is an atmospheric doom metal band from Curitiba, Brazil, whose sound combines heavy and acoustic guitars with dark atmospheric keyboards and melancholic variations. The band released the EP Ancient Ritual of the Season in June 2023, followed by their debut full-length Reflections of Emptiness in July 2024, the latter promoted internationally through MS Metal Agency Brasil. They also contributed a track to a Saturnus tribute album, signaling their engagement with the broader international doom metal community.

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.

Frozen Tears were a gothic/doom metal band from Valdivia, Chile, formed in late 2001 with a lineup that included violin alongside guitar, bass, and drums. The band released two demos — "Winds of Sadness and Darkness" (2002) and "Midnight Mists" (2003) — before going inactive.

Fuck the Law is a doom/death/stoner metal band from Rio de Janeiro, Brazil, formed in 2014. Citing Black Sabbath, Celtic Frost, Cathedral, Entombed, and Napalm Death as primary influences, the band crafts a heavy, riff-driven sound that blends traditional doom with death metal weight.

Fulanno is a stoner/doom metal trio from Coronda, Santa Fe, Argentina, consisting of Fila Frutos on guitar and vocals, Mauro Carosela on bass, and Jose A on drums. The band built an international cult following through their albums "Velas Negras" (2018) and "Nadie Está a Salvo del Mal" (2020), and returned in 2025 with "Nosotros Somos el Fin del Mundo" via Interstellar Smoke Records.