Fiasko is a post-metal band from Warsaw that has evolved toward sludge/black metal since their 2017 formation. Their stylistic journey from atmospheric post-metal to more aggressive sludge and black metal territory mirrors the restless creative energy of the Polish capital's underground scene.

Fire Walk with Us is an atmospheric sludge and post-metal/post-rock band from Amsterdam, active since 2008. Their Twin Peaks-referencing name hints at their taste for the uncanny and atmospheric, weaving dense sludge textures into sprawling post-metal compositions.

Firefly Waterfalls is a sludge/post-metal band from Odesa, Ukraine, formed in 2021. Their poetic name contrasts with the crushing weight of their sludge and post-metal from the Black Sea port city.

Firmam3nt is a sludge/doom/post-metal band from Collado-Villalba, Spain, formed in 2016. The band layers sludge and doom heaviness with post-metal atmospherics from the Sierra de Guadarrama mountain town near Madrid.

First Temple of the Atom is a doom/post-metal band from Glasgow, Scotland, formed in 2017. The band creates expansive, atmospheric doom and post-metal from Scotland's largest city.

Fissure of Riddles is a progressive/sludge/post-metal band from Weymouth, England, formed in 2014. The band merges progressive complexity with sludge and post-metal from the Dorset coast.

Flehmen is a post-metal/post-rock band from Voghera in the Pavia province of Lombardy, active since 2013. Their releases Casa Nera (2013) and Venus (2014) explore atmospheric, expansive soundscapes at the intersection of post-metal heaviness and post-rock introspection.

Flynotes is a progressive/post-metal/post-rock band from Saint Petersburg, Russia, active since 2011. They craft dynamic, compositionally ambitious music that moves fluidly between progressive metal complexity and post-rock atmospherics.

Fogdiver is a post-metal band from Brunswick, Germany, formed in 2013. The band creates dense, atmospheric post-metal soundscapes from the Lower Saxon city.