Filicide is a depressive black metal project from Tula, Russia, formed in 2018. Their name — meaning the killing of one's own child — signals the psychologically extreme territory of their depressive black metal from the city south of Moscow.

Filii Belial is an atmospheric black metal/ambient project from Moscow, Russia, formed in 2014. Their Latin name — 'Sons of Belial' — anchors their atmospheric extreme metal in demonic mythology.

Filii Eliae is a black/doom metal trio from Salerno, Italy, whose roots trace back to 1985 under prior names before adopting their current identity around 2010. Their Latin-titled releases Cimiterivm and Qvi Nobis Maledictvm Velit deliver a classically influenced blend of black and doom metal steeped in funereal imagery and occult ritual.

Filii Nigrantium Infernalium is a black metal band from Lisbon, active since 2015, evolving from pure black metal into a hybrid of black, heavy, and thrash metal. Their Latin name — 'Sons of the Blackened Infernal' — and stylistic breadth make them one of the more distinctive acts in the Portuguese underground.

Filthgrave is a black metal project from Oslo, Norway, formed in 2017. They channel the darkest currents of the Norwegian black metal tradition, adding to the capital city's storied and continually evolving extreme metal legacy.

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Fimbultyr is a black/Viking metal project from the Dalarna region, active since 2008. Named after a Norse epithet for Odin, they channel Viking mythology through black metal from one of Sweden's most culturally traditional provinces.

Fimbulvet is a pagan black metal band from Schmalkalden (near Meiningen), Germany, active since 2004 and self-described as "darkened pagan metal." Their extensive discography of eight albums — from "Gjallarhorn" (2004) through "Portale" (2023) — blends atmospheric darkness with pagan themes rooted in their Thuringian heritage.

Fimbulvetr is a black metal band from Berlin, Germany, active since 2005. Named after the great winter of Norse mythology that precedes Ragnarök, the band creates cold, unrelenting black metal.