Great Attractor is an instrumental progressive metal band from Mérida, Spain, formed in 2013, fusing styles ranging from stoner and sludge to avant-garde and post-rock. Their release Live at the Bujío (2024) captures their hour-long uninterrupted audiovisual performance across twelve compositions.

Green Dragon is a sludge/stoner/doom metal band from Torun, active since 2013. They deliver massive, fuzz-drenched stoner doom from the medieval Vistula city.

Green Eternity is a sludge/doom metal band from Malvern in Worcestershire, active since 2009. They channel heavy sludge and doom from the foot of the Malvern Hills.

Green Russian is a stoner/sludge metal and hardcore punk band from the Hanover/Nienburg area, Germany, formed in 2018, blending fuzz-heavy stoner grooves with sludge and hardcore punk energy. The band's name references the famous Russian Big Muff fuzz pedal.

Greengrave is a southern/sludge metal band from Volgograd, Russia, formed in 2024 and blending southern metal groove with sludge's crushing weight from the banks of the Volga. The project delivers swampy, down-tuned heaviness.

Greenhorn is a doom/sludge metal band from Bournemouth, formed in 2015. They channel heavy doom and sludge from the Dorset coast.

Greenthumb is a stoner/sludge/doom metal band from Alghero in the Sassari province of Sardinia, formed in 2018. They deliver heavy, fuzz-drenched metal from the Catalan-speaking coastal city.

Greg(o)rian is an atmospheric sludge/drone/doom metal project from London, active since 2010. They merge atmospheric sludge with drone doom from the British capital.

Greh is a sludge metal band from Karlsruhe, Germany, formed in 2022, channeling oppressive, low-tuned sludge from the Baden city. The band deals in the slowest, heaviest end of the sludge spectrum.