Guilles is an extreme metal band from Castellón de la Plana, Spain, formed in 2000 under the name Guilles de Rais and founded by guitarist Sevi, with seven albums to their name including ¿Quién Puede Matar a un Niño? and Harvest of Grey Days. Their sound is defined by a restless creative search across black and death metal territory, evolving substantially with each release.

Guldagnir is a black/doom metal and ambient project from Saint Petersburg, Russia, active since 2019 and merging the darkness of black metal with doom's oppressive weight and ambient textures. The project creates immersive, heavy sonic landscapes.

Guldan is a Bavarian black metal project formed in 2021, channeling dark, arcane black metal from southern Germany. The project operates in the tradition of the Bavarian underground.

Guldsjakal is a heavy/black/speed metal band from Copenhagen, Denmark, formed in 2020, whose name means "golden jackal" in Danish. The band blends classic heavy metal and speed metal with black metal intensity.

Guldur is a raw black metal project from Syracuse, Sicily, formed in 2024. Named after Tolkien's dark fortress, they deliver lo-fi black metal from the ancient Sicilian port city.

Odesa-based project launched in 2025, merging black metal, death metal, doom metal, and grindcore into an eclectic extreme metal fusion. Their genre-spanning approach defies easy categorization through sheer stylistic ambition.

Gurthadun is a Polish black metal project formed in 2024 and channeling the darkness of the Polish black metal tradition through raw, aggressive compositions. The project draws from one of the world's deepest national black metal scenes.

Gurthang is a black metal act from Mechelen, Belgium, formed in 2011, named after the cursed sword from Tolkien's Silmarillion. Their sound channels atmospheric black metal with depressive undercurrents, fitting the tradition of narrative-driven European black metal.

Gutha is a raw black metal project from Lecce in Puglia, active since 2005. Two decades of raw black metal from the Baroque capital of the Salento make them one of southern Italy's most enduring extreme acts.