Glasya is a symphonic metal band from Lisbon, Portugal, active since 2020 and named after the demon prince of the Ars Goetia, weaving orchestral grandeur into heavy metal. The project merges bombastic symphonic arrangements with powerful metal songwriting.

Glaucoma is a death metal and grindcore band from Angoulême, France, formed in 2021, delivering fast, aggressive extreme metal from the Charente department of western France. Their sound combines grindcore's velocity with death metal's crushing weight.

Glaudine is a heavy metal band from Munster, Germany, formed in 2018, working in the classic heavy metal tradition. The band contributes to the Westphalian city's diverse metal underground.

Glauk is a black metal project from Nice on the French Riviera, formed in 2023, channeling dark atmospheres and raw aggression in contrast to the Mediterranean setting. Their sound draws on the atmospheric end of the French black metal tradition.

Glaumni is an atmospheric black metal project from Snasa in central Norway, formed in 2015. They channel atmospheric black metal from the sparsely populated Trondelag interior.

Glaurung is a black/doom metal band from Småland, Sweden, active since 2014 and named after the father of dragons in Tolkien's legendarium. The project merges black metal's darkness with doom's crushing weight.

Glavio is a solo grindcore and goregrind project from northern France, created in 2007 by Antoine Dourlent, who also plays guitar in L.A.R.D.O.N. The prolific project has released eight albums over a decade, including the retrospective 10 Years of Putrid (2017) and numerous splits.

Gleaming Nocturnal Blood is a German black metal project from Lower Saxony, formed in 2026, among the newest entries in the European black metal underground. The project channels nocturnal themes through raw black metal.

Gleichmacher is a black metal act from Dresden, Germany, formed in 2019, delivering abrasive yet melodic black metal with high production values and second-wave feeling. Their 2022 album Krankung Fall Verderben features seven tracks mastered at Moontower Studios, praised for its many layers and depth blending melodic tones with raw harshness.