Gruiiiik is a Parisian goregrind project active since 2020, embracing a self-described "no lyrics, no talent" ethos of raw, unpolished extremity. Their releases include Demo 2020 and Ça Parle de Ta Mère!, delivering irreverent grind chaos.

Grummelgnom is an Upper Austrian solo metal project characterized by its creator as critical, angry, and unhinged—a self-described metal project from the forest with a pronounced sociopolitical edge. Releases including Kunst statt Krieg (Art Instead of War), Wut 2005–2009, and Waldwut in fünf Akten trace a decade-long output of avant-garde metal built on protest and social critique.

Grumo is a grindcore/death metal band from Modena, formed in 2015, having evolved from earlier goregrind/noise origins. Their shift toward more structured grindcore reflects a maturing approach to extreme music.

Grums is a stoner/doom metal band from Oslo, formed in 2016. They deliver heavy stoner doom from the Norwegian capital.

Grunge is a death metal band from Aberdeen, active since 2013. Their name — a genre tag borrowed from a very different musical tradition — brings deliberate irony to their death metal from the Scottish northeast.

Grunk is a grindcore band from Rugby in Warwickshire, formed in 2020. They deliver short, violent blasts of grindcore from the English Midlands.

Grunleggender is an atmospheric black metal project from High Peak in Derbyshire, formed in 2023. Their Norwegian-derived name and Peak District setting inform atmospheric black metal drawn from the moorland landscapes of northern England.

Grunter is a sludge metal band from Ancona on the Adriatic coast, formed in 2014. They deliver heavy sludge from the Marche regional capital.

Gruntlos is a black metal project from Hamburg, Germany, formed in 2022, whose name roughly translates to "without reason" in German. The project channels nihilistic black metal from the Hanseatic port city.