Forlorn World is a melodic death metal project from Manchester founded by Josh McMorran of Bloodshot Dawn, weaving epic narrative plots together with technical melodic death metal. Their 2020 concept album Umbra features guest solos from multiple musicians and was mastered by Jacob Hansen in a limited pressing of 400 copies.

Forlorn Yearning is a black metal project from Finland, formed in 2021. The project creates melancholic, yearning black metal.

Form is an experimental black metal project from Tartu, Estonia, formed in 2018. The project pushes black metal into experimental, boundary-defying territory from Estonia's intellectual center.

Form of Existence is a technical deathcore band from Sofia, Bulgaria, formed in 2023. The band combines the precision of technical musicianship with the brutality of deathcore, representing a newer wave of extreme music from the Bulgarian capital.

Formaldehyde is a death metal band from Almada on the south bank of the Tagus opposite Lisbon, formed in 2020 after earlier work in death/thrash metal. Their chemical-preservation name matches the clinical aggression of their death metal from greater Lisbon.

Formaline is a brutal death metal band from Moscow, Russia, formed in 2016. Named after the chemical preservative, they deliver clinical, precise brutal death metal from Moscow's deep extreme metal underground.

Formalist is a sludge/drone/doom metal supergroup from Piacenza, Italy, formed in 2014 by members of Forgotten Tomb, Malasangre, and Viscera///. Their releases We Inherit a World at the Seams and No One Will Shine Anymore aim to 'open new gates to total sonic horrors,' combining the heaviest elements of their parent bands into crushing experimental doom.

Formicarius is a London-based black metal band whose occult-themed output includes Lake of the Dead, Black Mass Ritual, and Rending the Veil of Flesh. The band has built a dedicated following through their dark, ritualistic approach to black metal since 2015.

Formicator is a London black metal act active since 2002, representing one of the longer-running projects in the city's extreme metal underground. The project delivers uncompromising black metal from the English capital.