New Orleans sludge and doom act Haarp draws heavily from the murk and misery of their city's storied extreme metal tradition. Since regrouping in 2014, they've built a reputation on crushing low-end riffs and an oppressive, swamp-soaked heaviness.

Knoxville, Tennessee's Hag Bastard throws sludge, stoner, and doom into a single foul-mouthed brew that feels native to the American South's heat and humidity. Since 2022, they've been one of the more colorfully named acts in the region's underground.

New Jersey's Hagmug has been slouching through the swamps of sludge metal since 2015, their downtuned riffing and misanthropic crawl fitting perfectly within the genre's uglier traditions. A name that matches the music.

Tulsa's Hagswine has been wallowing in stoner and sludge metal since 2013, combining the two genres' shared appetite for fuzz, filth, and low-tuned punishment. Oklahoma may not be on the metal map, but they've been making a case for it for over a decade.

Hailing from the small coastal community of Moyock, North Carolina, Hail!Hornet have been grinding out heavy sludge metal since 2011. Thick, churning, and corrosive — the kind of sound that feels like standing too close to a transformer fire.

Denver's Haitzuloan — their name drawn from the Basque word for "cave" — write sludge and doom metal that genuinely sounds like something dredged from underground. Formed in 2019, they're one of the heavier entries in Denver's already formidable heavy underground.

Pasadena's Half Moon Codex operate at the intersection of sludge, drone, and doom — long-form compositions that move with the patience of tectonic plates and the weight to match. Formed in 2018, they're a fixture in the Southern California heavy underground.

Ocean Springs, Mississippi's Hallelujah Gangbang match their provocative name with sludge and doom metal dredged straight from the Gulf Coast swamp — slow, mean, and spiritually filthy since 2016.

New York's Hallux carve out a sludge/doom sound built on weight and repetition — riffs that settle in and refuse to leave, tempos that drag the listener through the muck. Formed in 2018, location unspecified, but the music speaks clearly enough.

Atlanta's Halmos have been dragging riffs through the Georgia heat since 2012, fusing the molasses weight of sludge metal with the hazy warmth of stoner grooves. Their sound sits in the slow, crushing pocket where feedback meets sweat.

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Rooted in the gritty New Haven scene, Hang Your Cross weave together hardcore aggression, crawling sludge, and the expansive textures of post-metal into a dense, suffocating sound since 2017.

Drawing equally from the murk of New Orleans sludge and the frost of black metal, Hanged Man have lurked in the Crescent City's underground since 2011, building a sound as damp and oppressive as the city itself.

Virginia's Hard Bleed formed in Woodbridge in 2026, pressing groove metal muscle into sludge metal decay — a bruising and purposefully slow-burning new entry in the Northern Virginia underground.

Evansville, Indiana's Harijin traffic in the low-and-slow heaviness of sludge and stoner metal, piling up fuzz-saturated riffs with the unhurried confidence of a band that trusts the groove. Formed in 2020, they lean hard into the hypnotic side of heavy.