Grim Reefer A.D is a sludge/stoner metal band from Kingston upon Hull, formed in 2015. Their cannabis-referencing name captures the hazy, smoke-heavy character of their stoner sludge from East Yorkshire.

Grim Van Doom is a sludge metal band from Wuppertal, Germany, formed in 2012, known for splits with heavyweights like Cult of Occult and Danish post-metal act LLNN. Their catalog includes GRIM LOVE and a 2012 demo, establishing them as a formidable force in Germany's sludge underground.

Vienna's Grimms Eye are a three-piece formed in 2017 who fuse hardcore punk aggression with sludge and doom metal riffing into a dense, confrontational sound. Their discography includes the albums Act! and Throne (2022), the latter a ten-track statement of doom-laden punk hostility.

Grimpen Mire is a sludge/doom metal band from Birmingham, active since 2012. Named after the treacherous bog in Sherlock Holmes' The Hound of the Baskervilles, they deliver swamp-heavy sludge doom from England's second city.

Grimsrud is a doom/stoner/sludge metal band from Salford in Greater Manchester, formed in 2025. Named after the Fargo character, they deliver heavy stoner doom from the Manchester conurbation.

Groningen-based four-piece rooted in grindcore, hardcore, sludge, and powerviolence since 2005, navigating across subgenres while maintaining a foundation of blistering extremity. Members later formed the collective Onhou, continuing their impact on northern Netherlands' heavy music landscape.

Linköping-based progressive sludge metal outfit formed in 2014, merging the crushing weight of sludge with progressive rock's structural ambition. Their expansive compositions push beyond conventional heaviness into territory that rewards patient listening.

Groak is a sludge/doom metal band from Leeds, formed in 2015. Their name — an archaic British dialect word meaning to stare silently — matches the brooding, oppressive weight of their sludge doom from West Yorkshire.

Growing Horns is a doom/sludge metal band from Kortrijk, Belgium, formed in 2019, whose debut The Nobility of Pain (2019) and follow-up The Essence of Suffering (2025) deal in crushing, emotionally raw doom with bestial and mournful vocal textures. The Essence of Suffering was pressed on limited 180-gram vinyl at Dunk! pressing.