Guilhotina is a thrash metal band from Loures, near Lisbon, Portugal, chopping through riffs since 2008. Their name — Portuguese for 'guillotine' — signals their sharp, cutting thrash attack.

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.

Swedish thrash metal act launched in 2021, delivering high-velocity riffing with the execution-themed intensity their name suggests. Their aggressive approach carries forward the spirit of classic thrash.

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.