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.

Filth is a thrash metal band from Paris, France, formed in 2020. The band channels aggressive thrash metal from the French capital.

Filth of Mankind is a crust punk/death/thrash metal band from Gdansk, Poland, active since 2006. They fuse the political fury of crust punk with death and thrash metal extremity from the Baltic coast, delivering nearly two decades of aggressive, socially charged heavy music.

Filthy Christians is a death/thrash metal/grindcore band from Falun in the Dalarna region, active since 1990. Over three decades from the historic copper-mining city, they have maintained a commitment to grinding extreme metal that predates many of Sweden's better-known acts.

Filthy Sons is a death 'n' roll/thrash metal/crossover band from Córdoba, Spain, formed in 2022. The band blends the swagger of death 'n' roll with thrash speed and crossover punk energy from the historic Andalusian city.

Final Assault is a thrash metal/punk/hardcore band from Uusimaa, Finland, formed in 2016. The band blends thrash metal speed with punk and hardcore's raw energy.

Final Breath is a death/thrash metal band from Lohr, Germany, active since 1995. As one of the longer-running death/thrash acts in the Franconian scene, they have been delivering aggressive, riff-driven metal for three decades.

Final Command is a thrash metal band from Lidkoping on Lake Vanern, formed in 2020 and later incorporating punk rock elements. Their evolution from pure thrash toward punk-influenced territory reflects the cross-pollination common in Sweden's underground scene.

Final Cry is a heavy/power/thrash metal band from Hameln, Germany, whose sound later evolved toward melodic thrash/death metal. The band has navigated a stylistic journey from classic heavy and power metal roots into heavier, more aggressive territory.