Raging Sloth is a sludge and doom metal trio from Munich, Germany, formed in 2018 and featuring Max on bass and vocals, Mischa on guitar, and Jonas on drums. Self-describing their sound as 'heavy dystopian sounds in the realm of sludge and doom metal,' their releases include The Descent EP and the track Event Horizon.

Raging Speedhorn is a hardcore/sludge metal band from Corby in Northamptonshire, England, with renewed activity from 2019. The band delivers punishing sludge-hardcore from the East Midlands steel town.

Raglefant is a sludge/doom/stoner metal band from Zarautz on the Basque coast of Spain, formed in 2018. The band delivers heavy, fuzz-laden doom and sludge from the Cantabrian surf town in the Basque Country.

Milan sludge and stoner metal act formed in 2018, delivering crushing heaviness and fuzz-drenched riffs from Italy's economic capital. Their downtempo approach channels the oppressive weight central to the sludge tradition.

Rakete Ostkreuz is a Berlin-based instrumental sludge and stoner metal trio formed in 2022, combining 'a long-standing love for hard instrumental music and the Berlin railway station Ostkreuz.' Their 2022 debut Dunkles vom Fuzz is five tracks of fuzz-drenched instrumental doom conceived as a 'romantically nostalgic sound monument' to the ever-evolving train station.

Ramesses is a sludge/doom/death metal band from Wimborne Minster in Dorset, England, active since 2018. The band channels crushing, multi-layered extreme doom from the rural English south coast.

Ranch Destroyer is a sludge and stoner metal band from Minsk, Belarus, formed in 2018, blending southern metal heaviness with occult and fantasy themes alongside flashes of social commentary. The band self-releases their music independently through Bandcamp, operating in the Belarusian underground metal scene.

Raptor King is a sludge metal band from Boulogne-Billancourt near Paris, France, formed in 2015. The band delivers heavy, corroded sludge metal from the Parisian suburbs.

Vienna-based four-piece formed in 2022, Rat King Gone channels the rough underground energy of late-1980s to mid-1990s crossover thrash and sludge. Their 2025 album Sprezzatura offers a grim, caustic vision of societal collapse across 13 tracks, following their 2023 debut Homo Homini Lupus.