Soulpreacher is a sludge and doom metal band from Raleigh, North Carolina, active since 2000. One of the longer-running acts in the Southeast's heavy underground, they deliver lumbering, blues-infused heaviness characteristic of Southern sludge.

Sour Milk Theorem is a death/doom metal band from Hollywood, Maryland, formed in 2008, blending the funereal weight of doom metal with death metal's guttural heaviness for a sound steeped in slow-motion dread.

Sourvein is a veteran sludge/doom metal band from Wilmington, North Carolina, whose catalog of oppressive, swamp-soaked heaviness has made them a long-standing fixture of the Southern sludge underground since the early 2000s.

Sowbelly is a sludge/doom metal band from Durand, Michigan, active since 2009. They deal in slow, heavy riffs and oppressive atmosphere rooted firmly in the American sludge tradition.

Soyuz is a US stoner/doom metal band formed in 2020, named after the Soviet-era spacecraft and exploring the heavy, hypnotic riff territory where fuzzed-out stoner rock meets the weight of doom.

Space Coke is a stoner/doom metal band from Columbia, South Carolina, formed in 2015, delivering fuzz-laden, slow-burning riffs that sit at the intersection of heavy psychedelia and crushing doom.

Space God Ritual is a doom metal band from Portland, Oregon, formed in 2013. They craft slow, ceremonial doom with a cosmic dimension, emphasizing atmosphere and hypnotic repetition over speed.

Space Lord is a sludge/stoner/doom metal trio from Kenilworth, New Jersey, formed in 2017, stacking massive fuzzed-out riffs across the heavy spectrum from swampy sludge to slow, weed-charred doom.

Space Satan is a stoner/doom metal band from Monrovia, California, formed in 2016. Their sound combines the slow, crushing weight of doom with the hazy, riff-forward groove of stoner metal, owing a debt to the desert rock tradition of Southern California.

Space Wax are a San Diego, California band formed in 2014, straddling stoner, doom, and traditional heavy metal. Their sound leans into vintage-toned riffing and analogue warmth, drawing equally from classic heavy metal and the fuzzier end of the stoner/doom spectrum.

Spaceboy is a San Francisco band formed in 2017, navigating an eclectic intersection of progressive stoner, doom, and death metal. Their genre-blending approach reflects the Bay Area's history of genre-boundary-pushing heavy music, layering psychedelic texture over heavier structural ambitions.

Sparrowmilk is a doom and sludge metal band from Cleveland, Ohio, formed in 2017, trafficking in the city's tradition of slow, oppressive heaviness with droning riffs and suffocating atmosphere.

Spawn Winters is a gothic and doom metal band from Los Angeles, California, formed in 2016, weaving mournful atmosphere and heavy, downtuned riffs into a sound that draws equally from the melancholic gothic metal tradition and the glacial weight of doom.

Speaker Eater is an atmospheric sludge and doom metal band from Wausau, Wisconsin, formed in 2011, building massive, slow-burning compositions that blend post-hardcore dynamics with the crushing weight of sludge and the desolate sprawl of atmospheric doom.

Spectral Sorcery is a Pennsylvania psychedelic doom and stoner metal band formed in 2023, crafting slow, haze-drenched heavy music that prioritizes atmosphere and lysergic texture over aggression. Their sound draws from the fuzzed-out, riff-worshipping traditions of desert rock and occult doom.