Gorilla Monsoon is a sludge metal band from Dresden, Germany, founded in May 2001, known for their "distinctive and fucking murdering heavy sound" and brutal live performances. Their catalog includes Damage King (2006), Extermination Hammer (2008), and Firegod - Feeding the Beast (2015).

Gorilla Warrior is a doom and sludge metal trio from Oulu, Finland, consisting of Eetu Heikkinen on guitars and vocals, Tuomas Ojala on drums, and Olli Heikkinen on bass, self-described as creating 'primal noises.' Their 2026 debut Destroyer delivers five tracks of crushing doom-sludge including the eight-minute dirge Slow Crawl Towards Death.

Gormless is a sludge/doom metal band from the United Kingdom, formed in 2017. Their self-deprecating British name contrasts with the serious heaviness of their sludge/doom approach.

Gortaigh is a psychedelic sludge/doom metal band from the Krasnodar Krai in southern Russia, formed in 2026 and blending mind-bending psychedelia with crushing sludge and doom. The project delivers hazy, oppressive heaviness.

Gospel of the Future is a sludge metal band from the Olomouc region of the Czech Republic, formed in 2003 and recognized as one of the heaviest and loudest acts in the Czech underground. After a nearly decade-long hiatus they returned in 2021, releasing Blowtorch Mankind (2022) through Kabinet Records, following their earlier albums on Epidemie Records.

Grace Hayhurst is a sludge/progressive/post-metal solo artist from London, active since 2019. She blends the crushing weight of sludge with progressive complexity and post-metal atmospherics.

Graien is a four-piece black/sludge/post-metal band from Berlin, Germany, formed in 2023, named after the grey witch sisters of Greek mythology. Their 2025 release I Lay You to Rest was recorded and mastered by Stella Sesto at Pink Noise Studios in Berlin, blending atmospheric post-metal textures with sludge and black metal weight.

Grand Elder is a stoner/sludge metal band from Lancashire, formed in 2023. They deliver heavy, fuzz-laden sludge from the North West of England.

Grandad is a blackened hardcore/sludge metal band from London, formed in 2023. Their ironic name belies the crushing aggression of their blackened sludge from the British capital.