Fienden is a black metal project from Sweden, formed in 2025. Their name — Swedish for 'the enemy' — signals the hostile, confrontational character of their black metal.

Fiery Source is a black/death metal band from Polkowice in Lower Silesia, active since 2008. They deliver raw extreme metal from the copper-mining region of southwestern Poland, blending black and death metal traditions.

Fifteen Dead is a black metal/crust band from Aberdeen, Scotland, formed in 2011. The band fuses black metal aggression with crust punk's raw, politically charged energy from the northeast Scottish city.

Fight is a black metal project from Torun, Poland, active since 2010. They channel uncompromising black metal aggression from the medieval Hanseatic city on the Vistula, a UNESCO World Heritage site better known for its Gothic architecture than its extreme metal output.

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.