Guillotina is a Barcelona-based death metal band formed in 2019, self-described as 'd-beat infused death metal,' with releases including their self-titled debut, Mil Cortes, and Primera Sang. They have built an active international touring profile with dates spanning Mexico and the UK.

Guillotine is a Belgian thrash metal trio formed in 2016, operating under the Guillotine Dream name on Bandcamp, with a catalog that includes Lemuria, A War on the Passage of Time, and Blades Fall. The three-piece lineup of guitar/vocals, bass, and drums delivers a direct, riff-first thrash attack.

Guillty is a death metal/grindcore band from Leeds, formed in 2021. They deliver grinding death metal from the West Yorkshire city.

Guilty of Reason is a metal band from Strasbourg, France, spreading heavy/thrash/death metal and hardcore since 2004 with unwavering intensity. Their album Shades of Sanity (2013) was produced by Anthony Chognard and mastered at Kohlekeller Studios in Germany.

Guilty! Guilty! Guilty! is a psychedelic stoner/doom metal band from the United Kingdom, active since 2012. Their triple-verdict name captures the unrepentant, hedonistic spirit of their psychedelic stoner doom.

Guineapig is a goregrind project from Rome, active since 2013. They channel the deliberately repulsive extremity of goregrind from the Italian capital.

Guitar Heroes is a power metal and heavy metal band from Helsinki, Finland, formed in 2016, delivering guitar-driven anthemic metal with the soaring energy and melodic precision the power metal genre demands. Their sound celebrates the instrument at the heart of heavy metal.

Gulah is a heavy metal and thrash band from the small town of Villardompardo in Jaén, Spain, formed in 2017, channeling old-school aggression through ripping riffs and raw energy. Their sound pays homage to the classic thrash and heavy metal traditions with a distinctly Spanish underground sensibility.

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.