Guadaña is a heavy metal and power metal band from Puerto Real in Cádiz, Spain, active since 1999, with a deep catalog including albums Tambores de Guerra, En Carne Viva, Culpables, and Balear. Their extensive body of work spanning over two decades reflects a commitment to heavy, riff-driven Spanish-language metal.

Guarida is a heavy metal band from Seville, Spain, founded in 2005 by guitarist Yare and vocalist Capy, with their debut album Latiendo Vida arriving in 2016 after three prior EPs. Their sound blends melodic hard rock and heavy metal with personal, introspective Spanish-language lyrics.

Guernica is a heavy/power metal band from Kolin, Czech Republic, formed in 2023, bringing European-style power metal to the Central Bohemian region. The band is in the early stages of establishing their presence in the Czech metal scene.

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.

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.

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.

Gumbody is a thrash/heavy metal band from Horsens, Denmark, formed in 2020, delivering aggressive metal from the east Jutland port city. The band combines thrash energy with classic heavy metal foundations.

Gun Barrel is a heavy/power metal band from Cologne, Germany, formed in 2001, delivering classic German-style power metal with heavy metal grit from the Rhineland. The band has built over two decades of traditional metal output.