Sorxe is a Phoenix, Arizona post-metal and sludge metal band formed in 2013, crafting heavy, slow-burning compositions that balance visceral heaviness with atmospheric, expansive passages.

SOT is a New York sludge, doom, and hardcore hybrid band formed in 2011, fusing the oppressive heaviness of sludge and doom metal with the confrontational energy of hardcore punk.

Sough is a Chicago sludge and post-metal band formed in 2016, building dense, heavy soundscapes that reflect the grit of the city's heavy music scene while pushing toward more expansive, atmospheric territory.

Soul Dregs is a New Jersey sludge and stoner metal band formed in 2025, dealing in the slow, heavy, fuzz-drenched sounds that draw from both doom traditions and stoner rock.

Soul Terror is a Maryland band formed in 2013 that melds death metal, doom, and sludge into a slow-grinding, punishing sound. Their genre crossover places crushing heaviness at the center, drawing from both the morbidity of death metal and the oppressive weight of sludge and doom.

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.

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.

South Gate is a sludge metal band from Flat Rock, Michigan, formed in 2017, delivering slow-grinding, feedback-heavy heaviness rooted in the thick, abrasive textures at the core of the sludge metal tradition.

Southern Decay is a sludge metal band from San Antonio, Texas, formed in 2023, channeling the slow corrosive weight of Southern sludge into the fertile Texas heavy music scene.

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.

Space Cadaver is a psychedelic sludge metal band from New Orleans, Louisiana, formed in 2017. They channel the city's tradition of swampy, heavy music through hallucinogenic sludge riffs and a warped cosmic aesthetic.

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 Weed are a stoner/sludge metal band from Cape Canaveral, Florida, formed in 2021. Their name and location lean into the cosmic joke of launching heavy, slow-burning riffs from the shadow of NASA's launch facilities on the Space Coast.

Spacebeast is a sludge/stoner metal band from Portland, Oregon, formed in 2015. They combine the slow, grinding heaviness of sludge with the lysergic haze of stoner metal, fitting naturally into Portland's well-established heavy underground.

Spaisekult is a Vermont-based progressive sludge metal and hardcore band formed in 2022. They meld the caustic, slow-burning density of sludge metal with hardcore's propulsive urgency and progressive metal's structural ambition, operating on the experimental edge of all three genres.