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.

Rato Triste is a sludge noise band based in Prague, Czech Republic, formed in 2019 and self-describing their sound simply as 'sludge noise.' Their catalog includes a split tape with Amusia and multiple EPs, culminating in the release Choked by my own dreams.

Rats is a sludge/stoner metal band from Kingston upon Hull in East Yorkshire, England, active since 2010. Over a decade of heavy sludge from the Humber estuary port city.

Raucous is a sludge/post-metal band from Manchester, England, active since 2016. The band delivers atmospheric sludge and post-metal from one of the UK's great music cities.

Sludge/post-metal band from the Drogheda/Ardee area of County Louth, Ireland, active since 2014. Their approach blends sludge metal's crushing heaviness with post-metal's atmospheric expansiveness from the Irish east coast.