Firmament is an atmospheric/ambient black metal project from Erfurt, Germany, formed in 2021. The project creates vast, immersive black metal soundscapes from the Thuringian capital.

Firmamentum is an ambient/raw black metal project from Italy, active since 2014. Their debut Infinity Of The Forest was originally recorded on a small tape recorder — the band insists it is best heard in cassette format — blending raw black metal with dark ambient in a deliberately lo-fi, analog-first aesthetic.

Firn is a pagan black metal project from Thuringia, Germany, formed in 2022. The project — named for compacted snow that becomes glacier ice — channels cold, nature-inspired pagan black metal.

First Dawn is a melodic black metal project from Finland, formed in 2014. The project blends melody with the cold fury of black metal.

First Martyr is a black metal project from Rostov-on-Don in southern Russia, formed in 2022. They channel black metal intensity from the Don River metropolis, one of southern Russia's most culturally significant cities.

Firstborn is a melodic death/black metal band from Zagreb, Croatia, active since 2005 and one of the capital city's longer-running extreme metal acts. The project blends melodic death metal hooks with black metal atmospheres.

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Firtan is a pagan/black metal band from Lörrach, Germany, active since 2013 and described as a relentless force in the German extreme metal scene. Drawing from 1990s black metal inspiration, they have evolved into a more progressive entity across seven releases — from "Wogen der Trauer" (2013) through "Ethos" (2024) — captivating audiences with dynamic performances across Europe.

Firunwinta is a one-man Austrian black metal project forged, as the artist describes it, "in the mist of the Karawanken," the mountain range on the Austrian–Slovenian border. The project is operated by Kälte, and their 2022 EP "Innenleben..." and the 2025 EP "Klagelieder der Heimat" deliver raw, stripped-down third-wave black metal with shrill guitars and raspy vocals in the tradition of Ildjarn, Judas Iscariot, and Nargaroth.