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.

Guantanamo Party Program is a five-piece sludge metal and post-hardcore band from Wrocław, Poland, active since 2010 with four numbered albums documenting their evolution. The project merges the crushing weight of sludge with post-hardcore's dynamic intensity.

Guardians is a thrash metal and crossover band from Dusseldorf, Germany, formed in 2012, delivering mosh-worthy thrash and crossover from the Rhine-Ruhr metropolis. The band brings over a decade of aggressive thrash to the North Rhine-Westphalia scene.

Guardians of Time is a power metal band from Kristiansand, formed in 2018. They deliver epic power metal from the southern Norwegian coast.

GuardianSorrow is a prolific Spanish black metal project active since 2017, with an extensive solo discography of over fifteen releases including A Mad King's Dream, The Secret Temple of Silence, and the Mythical Outlands series. The project explores dark fantasy and melancholic themes through atmospheric, introspective black 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.

Guarreria is a death metal band from Barcelona, Spain, active since 2012, delivering raw and punishing extreme metal rooted in the city's thriving underground scene. Their sound channels the visceral aggression and unrelenting heaviness central to the death metal tradition.

Gud is a sludge/doom metal band from Drammen, formed in 2025. Their name — Norwegian for 'God' — contrasts with the crushing heaviness of their sludge doom.

Guderrha is a death metal band from Catanzaro in Calabria, formed in 2024. They bring death metal aggression to the capital of the southernmost mainland Italian region.